Download 2014 L.A. Amendment Building Code

182850
ORDINANCE NO.
_
An ordinance amending certain provisions of Articles 1 and 8 of Chapter IX of the
Los Angeles Municipal Code, to make local administrative changes and incorporate by
reference certain portions of the 2012 International Building Code and the 2013 Edition
of the California Building Code (CBC).
THE PEOPLE OF THE CITY OF LOS ANGELES
DO ORDAIN AS FOLLOWS:
Section 1. The first and second unnumbered paragraphs of Section 91.101 of
the Los Angeles Municipal Code are amended to read as follows:
SEC. 91.101. TITLE, PURPOSE AND SCOPE.
91.101.1. Title. This article shall be known as the Los Angeles Building Code or
Building Code or LABC, a portion of the Los Angeles Municipal Code (LAMC), and
wherever the word Code is used in this article, it shall mean the Los Angeles Building
Code. Sections of Article 1.5 of Chapter 9 of LAMC shall collectively be known as the
Los Angeles Residential Code or LARC. The provisions of the LARC for one- and twofamily Dwellings shall apply to the construction, alteration, movement, enlargement,
replacement, repair, equipment, use and occupancy, location, removal and demolition
of detached one- and two-family dwellings and townhouses not more than three stories
above grade plane in height with a separate means of egress and their accessory
structures. In addition to the LARC, appropriate Sections of Chapters 1, 11A, 11B, 17,
31, 31 B, 33, 34,63,67, 70, 71, 72, 81, 89, 92, 93 and 96 of the L.A.B.C. shall also be
applicable to one- and two-family dwellings and townhouses unless stated otherwise.
The Los Angeles Building Code and the Los Angeles Residential Code adopt by
reference portions of the 2013 California Building Code (CBC.)·or the 2013 California
Residential Code (CRC).
Sec. 2. Paragraphs 1 and 13 of Subsection 91.101.5 of the Los Angeles
Municipal Code are amended to read as follows:
1.
One-story detached accessory structures used as tool and storage
sheds, playhouses and similar uses, provided the floor area is not greater than
120 square feet, not located in Fire District 1 and does not contain any heating,
plumbing or electrical installation, and is located as permitted by the Los Angeles
Zoning Code.
13.
The depositing of rubbish or other material at any dump operated
by the City of Los Angeles or by any person pursuant to the provisions of
Section 66.25 of the Municipal Code.
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Sec. 3. Subsection 91.106.3.2.1 of the Los Angeles Municipal Code is amended
to read as follows:
91.106.3.2.1.
permit.
Site Plan. A plot of the site shall be filed with each application for a
EXCEPTION: The Superintendent of Building may grant the omission of a
site plot when the proposed work is of such a nature that no information is
needed to determine compliance with all laws relating to the location of buildings
or occupancies.
With respect to the site, the plot shall show the boundaries, lot lines, existing and
proposed buildings and structures, neighboring public ways, and sufficient dimensions
and other data to enable the Department to determine compliance with all laws relating
to the location of buildings or occupancies.
Sec. 4. Subsection 91.106.3.3.3 of the Los Angeles Municipal Code is amended
to read as follows:
91.106.3.3.3. For buildings exceeding 160 feet in height, each sheet of the structural
calculations and structural plans shall be prepared under the supervision of, and shall
bear the signature or approved stamp of, a person authorized to practice structural
engineering (Licensed Structural Engineer, S.E.) by the State of California. In addition,
all architectural sheets shall bear the signature or approved stamp of an architect
licensed by the state of California.
Sec. 5. Subsection 91.106.3.3.4 of the Los Angeles Municipal Code is amended
to read as follows:
91.106.3.3.4. Yard Restriction.
The increase in area permitted by CBC. Section 506.2
and Section 507 shall not be allowed unless or until the owner of the required yard and
open space files with the Department an agreement binding the owner, heirs and
assignees, to set aside the required yard as an unobstructed space having no
improvements. This agreement shall be recorded in the Los Angeles County
Recorder's Office.
Sec. 6. Subparagraphs B, C and D of Paragraph 5 of the Exceptions to
Subsection 91.106.4.1 of the Los Angeles Municipal Code are amended to read as
follows:
B.
This (Exception 5) shall not apply if the building is to be
demolished and is:
(i)
Constructed of unreinforced masonry construction
and built pursuant to a building permit issued prior to October I,
1933; or
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(ii)
To be demolished pursuant to a demolition order
issued by the Department under authority set forth in Division 89 of
Article I of Chapter IX of the Los Angeles Municipal Code.
C.
This (Exception 5) shall not apply if the applicant
demonstrates to the satisfaction of the Department that the site will be
developed with housing for low to moderate-income households, which
housing is to be developed, constructed or acquired with federal, state or
local government financial assistance.
D.
This (Exception 5) shall not apply to two-family dwellings or
to apartment houses and apartment hotels containing three dwelling units,
provided that at least one dwelling unit in each such building is occupied
by a record owner of the property.
Sec. 7. The second unnumbered paragraph of Subsection 91.107.7 of the
Los Angeles Municipal Code is amended to read as follows:
Certified security bar installers shall file Security Bar Certificates of Compliance
in accordance with provisions of Paragraph 2 of Subsection 91.108.12.1 of this Code.
Sec. 8. Section 91.112 of the Los Angeles Municipal Code is deleted in its
entirety.
Sec. 9. A new Section 91.113 is added to the Los Angeles Municipal Code
immediately preceeding Table No. i-A to read as follows:
SEC. 91.113. PERMIT FEES.
Sec. 10. Section 91.200 of the Los Angeles Municipal Code is renumbered as
Section 91.201 and amended to read as follows:
SEC. 91.201. GENERAL.
Chapter 2 of the CBC is adopted by reference with the following exceptions,
modifications and additions:
Sec. 11. Section 91.202 of the Los Angeles Municipal Code is amended by
adding the following definitions in alphabetical order to read as follows:
APPROVED AGENCY or APPROVED TESTING AGENCY. An
established and recognized agency regularly engaged in conducting tests or
furnishing inspection services which has been approved.
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APPROVED FABRICATOR. An established and qualified person, firm or
corporation approved by the Superintendent of Building pursuant to Division 17
of this Code and LAMC Section 96.200.
Sec. 12. Division 3 of Article 1, Chapter IX of the Los Angels Municipal Code is
amended by deleting the following notation in its entirety:
*
The following sections in Division 3 are deleted in entirety by
Ord. No. 172,592:
91.301; 9.303; 91.305; 91.307; 91.308, 91.310 thru 91.312.
Sec. 13. Section 91.400 of the Los Angeles Municipal Code is amended to read
as follows:
SEC. 91.400.
BASIC PROVISIONS.
Chapter 4 of the California Building Code is hereby adopted by reference.
Sec. 14. Subsections 91.403.1 through 91.403.6 of the Los Angeles Municipal
Code are deleted in their entirety.
Sec. 15. Division 6 of Article 1, Chapter IX of the Los Angeles Municipal Code is
amended by deleting the following notation in its entirety:
*
The following sections in Division 6 are deleted in entirety by
Ord. No. 172,592:
91.601 thru 91.603.
Sec. 16. Division 7 of Article 1, Chapter IX of the Los Angeles Municipal Code is
amended by deleting the following notation in its entirety:
*
Ord. No. 172,592:
The following sections in Division 7 are deleted in entirety by
91.709; 91.710; 91.713
Sec. 17. Division 8 of Article 1, Chapter IX of the Los Angeles Municipal Code is
amended by deleting the following notation in its entirety:
*
Ord. No. 172,592:
The following sections in Division 8 are deleted in entirety by
91.802; 91.804.
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Sec. 18. Section 91.1207 of the Los Angeles Municipal Code is amended to
read as follows:
SEC. 91.1207. SOUND TRANSMISSION.
Section 1207 of the CSC is adopted by reference, except Sections 1207.1,
1207.11.1,1207.11.3,1207.11.4,
and 1207.12 of the CSC are not adopted, and in lieu,
Subsections 91.1207.1,91.1207.3,91.1207.4,91.1207.5,
91.1207.6, 91.1207.7,
91.1207.8,91.1207.9,91.1207.10,
91.1207.11.1, 91.1207.11.2, 91.1207.11.3,
91.1207.11.4,91.1207.12
and 91.1207.13 are added.
Sec. 19. A new Subsection 91.1207.2 is added to the Los Angeles Municipal
Code to read as follows:
91.1207.2.
Defi nitions.
The following special definitions shall apply to this section:
SOUND TRANSMISSION CLASS (STC) is a single-number rating used to
compare walls, floor-ceiling assemblies and doors for their sound-insulating
properties with respect to speech and small household appliance noise. The
STC is derived from laboratory measurements of sound transmission loss across
a series of 16 test bands. Laboratory STC ratings should be used to the greatest
extent possible in determining that the design complies with this section.
FIELD SOUND TRANSMISSION CLASS (FSTC) is a single-number
rating similar to STC, except that the transmission loss values used to derive the
FSTC are measured in the field. All sound transmitted from the source room to
the receiving room is assumed to be through the separating wall or floor-ceiling
assembly. This section does not require determination of the FSTC, and fieldmeasured values of noise reduction should not be reported as transmission loss.
IMPACT INSULATION CLASS (IIC) is a single-number rating used to
compare the effectiveness of floor-ceiling assemblies in providing reduction of
impact-generated sounds such as footsteps. The IIC is derived from laboratory
measurements of impact sound pressure level across a series of 16 test bands
using a standardized tapping machine. Laboratory IIC ratings should be used to
the greatest extent possible in determining that the design complies with this
section.
FIELD IMPACT INSULATION CLASS (FIIC) is a single-number rating
similar to the IIC, except that the impact sound pressure levels are measured in
the field.
NOISE ISOLATION CLASS (NIC) is a single-number rating derived from
measured values of noise reduction between two enclosed spaces that are
connected by one or more paths. The NIC is not adjusted or normalized to a
standard reverberation time.
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NORMALIZED NOISE ISOLATION CLASS (NNIC) is a single-number
rating similar to the NIC, except that the measured noise reduction values are
normalized to a reverberation time of one-half second.
NORMALIZED A-WEIGHTED SOUND LEVEL DIFFERENCE (On)
means for a specified source room sound spectrum, On is the difference, in
decibels, between the average sound levels produced in two rooms after
adjustment to the expected acoustical conditions when the receiving room under
test is normally furnished.
DAY-NIGHT AVERAGE SOUND LEVEL (Ldn) is the A-weighted
equivalent continuous sound exposure level for a 24-hour period with a 10 db
adjustment added to sound levels occurring during nighttime hours (10 p.m. to
7 a.m.).
COMMUNITY NOISE EQUIVALENT LEVEL (CNEL) is a metric similar to
the Ldn, except that a 5 db adjustment is added to the equivalent continuous
sound exposure level for evening hours (7 p.m. to 10 p.m.) in addition to the 10
db nighttime adjustment used in the Ldn.
Sec. 20. A new Subsection 91.1207.3 is added to the Los Angeles Municipal
Code to read as follows:
91.1207.3. Relevant Standards. The current edition of the following standards is
generally applicable for determining compliance with this section, copies may be
obtained from the American Society for Testing and Materials (ASTM) at 100 Barr
Harbor Drive, West Conshohocken, PA, 19428-2959: ASTM C 634, Standard
Terminology Relating to Building and Environmental Acoustics; ASTME 90, Standard
Test Method for Laboratory Measurement of Airborne Sound Transmission Loss of
Building Partitions and Elements; ASTM E 336, Standard Test Method for Measurement
of Airborne Sound Attenuation Between Rooms in Buildings; ASTM E 413,
Classification for Rating Sound Insulation; ASTM E 492, Standard Test Method for
Laboratory Measurement of Impact Sound Transmission Through Floor-Ceiling
Assemblies Using the Tapping Machine; ASTM E 497, Standard Recommended
Practice for Installation of Fixed Partitions of Light Frame Type for the Purpose of
Conserving Their Sound Insulation Efficiency; ASTM E 597, Recommended Practice for
Determining a Single-Number Rating of Airborne Sound Isolation in Multi-unit Building
Specifications; ASTM E 966, Standard Guide for Field Measurements of Airborne
Sound Insulation of Building Facades and Facade Elements; ASTM E 989, Standard
Classification for Determination of Impact Insulation Class (IIC); ASTM E 1007,
Standard Test Method for Field Measurement of Tapping Machine Impact Sound
Transmission Through Floor-Ceiling Assemblies and Associated Support Structures;
and ASTM E 1014, Standard Guide for Measurement of Outdoor A-Weighted Sound
Levels.
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Sec. 21. A new Subsection 91.1207.4 is added to the Los Angeles Municipal
Code to read as follows:
91.1207.4. Complaints.
Where a complaint as to noncompliance with this chapter
requires a field test, the complainant shall post a bond or adequate funds in escrow for
the cost of said testing. Such costs shall be chargeable to the complainant if the field
tests show compliance with this chapter. If the tests show noncompliance, testing costs
shall be borne to the owner or builder.
Sec. 22. A new Subsection 91.1207.5 is added to the Los Angeles Municipal
Code to read as follows:
91.1207.5. Local Modification.
The governing body of any city or county or city and
county may, by ordinance, adopt changes or modifications to the requirements of this
section as set forth in Section 17922.7 of the Health and Safety Code.
Sec. 23. A new Subsection 91 .1207.6 is added to the Los Angeles Municipal
Code to read as follows:
91.1207.6.
Interdwelling
Sound Transmission
Control.
91.1207.6.1. Wall and Floor-Ceiling Assemblies.
Wall and floor-ceiling assemblies
separating dwelling units or guest rooms from each other and from public or service
areas such as interior corridors, garages and mechanical spaces shall provide airborne
sound insulation for walls, and both airborne and impact sound insulation for floorceiling assemblies.
EXCEPTION: Impact sound insulation is not required for floor-ceiling
assemblies over nonhabitable rooms or spaces not designed to be occupied,
such as garages, mechanical rooms or storage areas.
Sec. 24. A new Subsection 91.1207.7 is added to the Los Angeles Municipal
Code to read as follows:
91.1207.7. Airborne Sound Insulation. All such acoustically rated separating wall
and floor-ceiling assemblies shall provide airborne sound insulation equal to that
required to meet a sound transmission class (STC) rating of 50 based on laboratory
tests as defined in ASTM E 90 and E 413. Field-tested assemblies shall meet a noise
isolation class (NIC) rating of 45 for occupied units and a normalized noise isolation
class (NINIC) rating of 45 for unoccupied units as defined in ASTM E 336 and E 413.
ASTM E 597 may be used as simplified procedure for field tests of the airborne sound
isolation between rooms in unoccupied buildings. In such tests, the minimum value of
Dn is 45 db for compliance. Entrance doors from interior corridors together with their
perimeter seals shall have STC ratings not less than 26. Such tested doors shall
operate normally with commerdally available seals. Solid-core wood-slab doors 13/8
inches (35 mm) thick minimum or 18 gauge insulated steel-slab doors with compression
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seals all around, including the threshold, may be considered adequate without other
substantiating information. Field tests of corridor walls should not include segments
with doors. If such tests are impractical, however, the NIC or NNIC rating for the
composite wall-door assembly shall not be less than 30. Penetrations or openings in
construction assemblies for piping, electrical devices, recessed cabinets, bathtubs,
soffits or heating, ventilating or exhaust ducts shall be sealed, lined, insulated or
otherwise treated to maintain the required ratings.
Sec. 25. A new Subsection 91.1207.8 is added to the Los Angeles Municipal
Code to read as follows:
91.1207.8. Impact Sound Insulation. All acoustically rated separating floor-ceiling
assemblies shall provide impact sound insulation equal to that required to meet a IIC
rating of 50 based on laboratory tests as defined in ASTM E 492 and E 989. Fieldtested assemblies shall meet a field impact insulation class (FIIC) rating of 45 for both
occupied and unoccupied units as defined in ASTM E 1007 and E 989, with the
exception that the measured impact sound pressure levels shall not be normalized to a
standard amount of absorption in the receiving room. Floor coverings may be included
in the assembly to obtain the required ratings. These coverings must be retained as a
permanent part of the assembly and may be replaced only by other floor coverings that
provide the required impact sound insulation.
Sec. 26. A new Subsection 91.1207.9 is added to the Los Angeles Municipal
Code to read as follows:
91.1207.9. Tested Assemblies. Laboratory-tested wall or floor-ceiling designs having
STC or IIC ratings of 50 or more may be used by the Building Official to determine
compliance with this section during plan review phase. Field tests shall be required by
the Building Official when evidence of sound leaks or flanking paths is noted, or when
the separating assembly is not built according to the approved design. Generic sound
transmission control systems as listed in the Catalog of STC and IIC Ratings for Wall
and Floor-Ceiling Assemblies, as published by the Office of Noise Control, California
Department of Health Services, or the Fire Resistance Design Manual, as published by
the Gypsum Association, may be used to evaluate construction assemblies for their
sound transmission properties. Other tests from recognized laboratories may also be
used. When ratings for essentially similar assemblies differ, and when ratings are
below STC or IIC 50, field testing may be used to demonstrate that the building
complies with this section. For field testing, rooms should ideally be large and
reverberant for reliable measurements to be made in all test bands. This is often not
possible for bathrooms, kitchens, hallways or rooms with large amounts of soundabsorptive materials. Field test results should, however, report the measured values in
all bands, noting those which do not meet relevant ASTM criteria for diffusion. It should
be noted that STC ratings do not adequately characterize the sound insulation of
construction assemblies when the intruding noise is predominantly low-pitched, as is
often produced by amplified music or by large pieces of mechanical equipment. It
should also be noted that the transmission of impact sound from a standardized tapping
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machine may vary considerably for a given design due to differences in specimen size,
flanking transmission through associated structure and the acoustical response of the
room below. Laboratory IIC values should therefore be used with caution when
estimating the performance of hard-surfaced floors in the field. Additionally, IIC ratings
may not always be adequate to characterize the subjectively annoying creak or boom
generated by footfalls on a lumber floor.
Sec. 27. A new Subsection 91.1207.10 is added to the Los Angeles Municipal
Code to read as follows:
91.1207.10. Certification. Field testing, when required, shall be done under the
supervision of a person experienced in the field of acoustical testing and engineering,
who shall forward test results to the Building Official showing that the sound isolation
requirements stated above have been met. Documentation of field test results should
generally follow the requirements outlined in relevant ASTM standards.
Sec. 28. A new Subsection 91.1207.11 is added to the Los Angeles Municipal
Code to read as follows:
91.1207.11.
Exterior Sound Transmission Control.
Sec. 29. A new Subsection 91 .1207.11 .2 is added to the Los Angeles Municipal
Code to read as follows:
91.1207.11.2. Allowable Interior Noise Levels. Interior noise levels attributable to
exterior sources shall not exceed 45 db in any habitable room. The noise metric shall
be either the day-night average sound level (Ldn) or the community noise equivalent
level (CNEL), consistent with the noise element of the local general plan.
Note: Ldn is the preferred metric for implementing these standards. Worst-case
noise levels, either existing or future, shall be used as the basis for determining
compliance with this section. Future noise levels shall be predicted for a period of at
least ten (10) years from the time of building permit application.
Sec. 30. A new Subsection 91.1207.13 is added to the Los Angeles Municipal
Code to read as follows:
91.1207.13. Field Testing. When inspection indicates that the construction is not in
accordance with the approved design, or that the noise reduction is compromised due
to sound leaks or flanking paths, field testing may be required. A test report showing
compliance or noncompliance with prescribed interior allowable levels shall be
submitted to the building official. Measurements of outdoor sound levels shall generally
follow the guidelines in ASTM E 1014. Field measurements of the A-weighted airborne
sound insulation of buildings from exterior sources shall generally follow the guidelines
in ASTM E 966. For the purpose of this standard, sound level differences measured in
unoccupied units shall be normalized to a receiving room reverberation time of one-half
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second. Sound level differences measured in occupied units shall not be normalized to
a standard reverberation time.
Sec. 31. Section 91.1300 of the Los Angeles Municipal Code is amended to
read as follows:
SEC. 91.1300. GENERAL.
In order to comply with the purpose of this division, buildings shall be designed to
comply with the requirements of Part 6, Title 24 of the California Building Standards
Code - California Energy Code, 2013 Edition.
Sec. 32. Section 91.1507 of the Los Angeles Municipal Code is amended to
read as follows:
SEC. 91.1507. REQUIREMENTS FOR ROOF COVERINGS.
Section 1507 of the CBC is adopted by reference, except Sections 1507.3.1, and
Table 1507.3.7 of the CSC are not adopted and in lieu, Subsection 91.1507.3.1 and
Table 1507.3.7 of this Code are added.
Sec. 33. The Title of Division 16 of Article 1 of Chapter IX of the Los Angeles
Municipal Code is amended to read as follows:
ARTICLE 1, DIVISION 16
STRUCTURAL DESIGN
Sec. 34. Subsection 91.1603.1.9 of the Los Angeles Municipal Code is amended
to read as follows:
91.1603.1.9. Systems and Components Requiring Special Inspections for Seismic
Resistance. Construction documents or specifications shall be prepared for those
systems and components requiring special inspection for seismic resistance as
specified in Section 91.1705.11 by the registered design professional responsible for
their design and shall be submitted for approval in accordance with Section 91.106.3.3.
Reference to seismic standards in lieu of detailed drawings is acceptable.
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Sec. 35. Section 91.1609 of the Los Angeles Municipal Code is amended to
read as follows:
SEC. 91.1609. WIND LOADS.
Section 1609 of the CBC is adopted by reference, and Subsection 91.1609.1.1.2
is added as follows:
91.1609.1.1.2. Hig h Wind Velocity Areas. The Superintendent of Building may
designate certain areas of the City as "high wind velocity areas" when evidence or
studies indicate that the wind velocity results in damage to structures conforming to the
minimum requirements of this Code. The Superintendent of Building may specify
additional requirements over and above those required by this Code with respect to the
following:
1.
Glazing of openings in exterior walls;
2.
Anchorage of post and beam construction;
3.
Cantilever overhangs; and
4.
Roofing and roof framing.
Sec. 36. Section 91 .1613 of the Los Angeles Municipal Code is amended to
read as follows:
SEC. 91.1613. EARTHQUAKE
LOADS.
Section 1613 of the CBC is adopted by reference, CBC Section 1613.6.7 is not
adopted and, in lieu, Subsections 91.1613.5.3 through 91.1613.10.5 are added or
amended to read as follows.
91.1613.5.3.
ASCE 7, Section 12.2.3.1, Exception 3 is modified to read as follows:
3. Detached one- and two- family dwellings up to two stories in height of
light frame construction.
91.1613.5.4.
follows:
General.
The text of ASCE 7, Section 12.11.2.2.3 is modified to read as
12.11.2.2.3. Wood Diaphragms.
In wood diaphragms, the continuous
ties shall be in addition to the diaphragm sheathing. Anchorage shall not be
accomplished by use of tow nails or nails subject to withdrawal nor shall wood
ledgers or framing be used in cross-grain bending or cross-grain tension. The
diaphragm sheathing shall not be considered effective as providing ties or struts
required by this Section.
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For structures assigned to seismic Design Category D, E or F, wood
diaphragms supporting concrete or masonry walls shall comply with the
following:
1.
The spacing of continuous ties shall not exceed 40 feet.
Added chords of diaphragms may be used to form subdiaphragms to
transmit the anchorage forces to the main continuous crossties.
2.
The maximum diaphragm shear used to determine the depth
of the subdiaphragm shall not exceed 75% of the maximum diaphragm
shear.
91.1613.5.5. The Equation 12.2-1 of ASCE 7, Section 12.12.3 is modified to read as
follows:
CdOmax
I
91.1613.5.6.
follows:
General. The text of ASCE 7, Section 12.12.5 is modified to read as
12.12.5. Deformation Compatibility for Seismic Design Category D
through F. For structures assigned to Seismic Design Category D, E or F, every
structural component not included in the seismic force-resisting system in the
direction under consideration shall be designed to be adequate for the gravity
load effects and the seismic forces resulting from displacement to the design
story drift (.6.) as determined in accordance with Section 12.8.6 (see also
Section 12.12.1).
EXCEPTION: Reinforced concrete frame members not designed
as part of the seismic force-resisting system shall comply with
Section 21.9 of ACI 318.
Where determining the moments and shears induced in components that
are not included in the seismic force-resisting system in the direction under
consideration, the stiffening effects of adjoining rigid structural and nonstructural
elements shall be considered and a rational value of member and restraint
stiffness shall be used.
When designing the diaphragm to comply with the requirements stated
above, the return walls and fins/canopies at entrances shall be considered.
Seismic compatibility with the diaphragm shall be provided by either seismically
isolating the element or by attaching the element and integrating its load into the
diaphragm.
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91.1613.6.
Reserved.
91.1613.7.
Reserved.
91.1613.8.
Additional Seismic Requirements.
91.1613.8.1. Scope. This part contains special requirements for suspended ceilings
and lighting systems. The provisions of Section 13.5.6 of ASCE 7 shall apply except as
modified here.
91.1613.8.1.2.
Design and Installation Requirements.
91.1613.8.1.2.1. Bracing at Discontinuity. Positive bracing to the structure shall be
provided at changes in the ceiling plane elevation or at discontinuities in the ceiling grid
system.
91.1613.8.1.2.2. Support for Appendages. Cable trays, electrical conduits and piping
shall be independently supported and independently braced from the structure.
91.1613.8.1.2.3. Sprinkler Heads. All sprinkler heads (drops) except fire-resistancerated floor/ceiling or roof/ceiling assemblies, shall be designed to allow for free
movement of the sprinkler pipes with oversize rings, sleeves or adaptors through the
ceiling tile in accordance with Section 13.5.6.2.2(e) of ASCE 7.
Sprinkler heads penetrating fire-resistance-rated floor/celling or roof/ceiling
assemblies shall comply with CBC Section 713. Sprinkler heads and other penetrations
shall have a 2 in. (50mm) oversize ring, sleeve or adapter through the ceiling tile to
allow for free movement of at least 1 in. (25mm) in all horizontal directions.
Alternatively, a swing joint that can accommodate 1 in. (25 mm) of ceiling movement in
all horizontal directions is permitted to be provided at the top of the sprinkler head
extension.
91.1613.8.1.3. Special Requirements for Means of Egress. Suspended ceiling
assemblies located along means of egress serving an occupant load of 30 or more shall
comply with the following provisions:
91.1613.8.1.3.1. General. Ceiling suspension systems shall be connected and braced
with vertical hangers attached directly to the structural floor or roof system above and
along the means of egress serving an occupant load of 30 or more and at lobbies
accessory to Group A Occupancies. Spacing of vertical hangers shall not exceed 2 feet
(610 mm) on center along the entire length of the suspended ceiling assembly located
along the means of egress or at the lobby.
91.1613.8.1.3.2. Assembly Device. All lay-in panels shall be secured to the
suspension ceiling assembly with two hold-down clips minimum for each tile within a
4-foot (1219 mm) radius of the exit lights and exit signs.
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91.1613.8.1.3.3. Emergency Systems. Independent supports and braces shall be
provided for light fixtures required for exit illumination. Power supply for exit illumination
shall comply with the requirements of CSC Section 1006.3.
91.1613.8.1.3.4. Supports for Appendage. Separate support from the structural floor
or roof system above shall be provided for all appendages such as light fixtures, air
diffusers, exit signs and similar elements.
91.1613.9.
Seismic Design Provisions for Hillside Buildings.
91.1613.9.1. Purpose. The purpose of this section is to establish minimum regulations
for the design and construction of new buildings and additions to existing buildings
when constructing such buildings on or into slopes steeper than one unit vertical in
three units horizontal (33.3%). These regulations establish minimum standards for
seismic force resistance to reduce the risk of injury or loss of life in the event of
earthquakes.
91.1613.9.2. Scope. The provisions of this section shall apply to the design of the
lateral-force-resisting system for hillside buildings at and below the base level
diaphragm. The design of the lateral-force-resisting system above the base level
diaphragm shall be in accordance with the provisions for seismic and wind design as
required elsewhere in this division.
EXCEPTION: Non-habitable accessory buildings and decks not
supporting or supported from the main building are exempt from these
regulations.
91.1613.9.3.
as follows:
Definitions.
For the purposes of this section, certain terms are defined
BASE LEVEL DIAPHRAGM is the floor at, or closest to, the top of the
highest level of the foundation.
DIAPHRAGM ANCHORS are assemblies that connect a diaphragm to the
adjacent foundation at the uphill diaphragm edge.
DOWNHILL DIRECTION is the descending direction of the slope
approximately perpendicular to the slope contours.
FOUNDATION is concrete or masonry, which supports a building,
including footings, stem walls, retaining walls, and grade beams.
FOUNDATION EXTENDING IN THE DOWNHILL DIRECTION is a
foundation running downhill and approximately perpendicular to the uphill
foundation.
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HILLSIDE BUILDING is any building or portion thereof constructed on or
into a slope steeper than one unit vertical in three units horizontal (33.3%). If
only a portion of the building is supported on or into the slope, these regulations
apply to the entire building.
PRIMARY ANCHORS are diaphragm anchors designed for and providing
a direct connection as described in Sections 1613.7.5.and 1613.7.7.3 between
the diaphragm and the uphill foundation.
SECONDARY ANCHORS are diaphragm anchors designed for and
providing a redundant diaphragm to foundation connection, as described in
Sections 1613.7.6 and 1613.7.7.4.
UPHILL DIAPHRAGM EDGE is the edge of the diaphragm adjacent and
closest to the highest ground level at the perimeter of the diaphragm.
UPHILL FOUNDATION is the foundation parallel and closest to the uphill
diaphragm edge.
91.1613.9.4.
Analysis
and Design.
91.1613.9.4.1. General. Every hillside building within the scope of this section shall be
analyzed, designed and constructed in accordance with the provisions of this division.
When the code-prescribed wind design produces greater effects, the wind design shall
govern, but detailing requirements and limitations prescribed in this and referenced
sections shall be followed.
91.1613.9.4.2. Base Level Dlaphraqm-Downhill
Direction. The following provisions
shall apply to the seismic analysis and design of the connections for the base level
diaphragm in the downhill direction.
91.1613.9.4.2.1. Base for Lateral Force Design Defined. For seismic forces acting in
the downhill direction, the base of the building shall be the floor at, or closest to, the top
of the highest level of the foundation.
91.1613.9.4.2.2. Base Shear. In developing the base shear for seismic design, the
response modification coefficient (R) shall not exceed 5 for bearing wall and building
frame systems. The total base shear shall include the forces tributary to the base level
diaphragm including forces from the base level diaphragm.
91.1613.9.5.
Base Shear Resistance-Primary
Anchors.
91.1613.9.5.1. General. The base shear in the downhill direction shall be resisted
through primary anchors from diaphragm struts provided in the base level diaphragm to
the foundation.
15
91.1613.9.5.2. Location of Primary Anchors. A primary anchor and diaphragm strut
shall be provided in line with each foundation extending in the downhill direction.
Primary anchors and diaphragm struts shall also be provided where interior vertical
lateral-force-resisting elements occur above and in contact with the base level
diaphragm. The spacing of primary anchors and diaphragm struts or collectors shall in
no case exceed 30 feet (9144 mm).
91.1613.9.5.3. Design of Primary Anchors and Diaphragm Struts. Primary anchors
and diaphragm struts shall be designed in accordance with the requirements of
Section 1613.7.8.
91.1613.9.5.4. Limitations. The following lateral-force-resisting elements shall not be
designed to resist seismic forces below the base level diaphragm in the downhill
direction:
1.
Wood structural panel wall sheathing,
2.
Cement plaster and lath,
3.
Gypsum wallboard, and
4.
Tension only braced frames.
Braced frames designed in accordance with the requirements of
Section 2205.2.2 may be used to transfer forces from the primary anchors and
diaphragm struts to the foundation provided lateral forces do not induce flexural
stresses in any member of the frame or in the diaphragm struts. Deflections of
frames shall account for the variation in slope of diagonal members when the
frame is not rectangular.
91.1613.9.6.
Base Shear Resistance-Secondary
Anchors.
91.1613.9.6.1. General. In addition to the primary anchors required by
Section 91.1613.7.5, the base shear in the downhill direction shall be resisted through
secondary anchors in the uphill foundation connected to diaphragm struts in the base
level diaphragm.
EXCEPTION: Secondary anchors are not required where foundations
extending in the downhill direction spaced at not more than 30 feet (9144 mm) on
center extend up to and are directly connected to the base level diaphragm for at
least 70% of the diaphragm depth.
91.1613.9.6.2. Secondary Anchor Capacity and Spacing. Secondary anchors at the
base level diaphragm shall be designed for a minimum force equal to the base shear,
including forces tributary to the base level diaphragm, but not less than 600 pounds per
lineal foot (8.76 kN/m). The secondary anchors shall be uniformly distributed along the
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uphill diaphragm edge and shall be spaced a maximum of four feet (1219 mm) on
center.
91.1613.9.6.3. Design. Secondary anchors and diaphragm struts shall be designed in
accordance with Section 91.1613.9.8.
91.1613.9.7. Diaphragms Below the Base Level-Downhlll Direction. The following
provisions shall apply to the lateral analysis and design of the connections for all
diaphragms below the base level diaphragm in the downhill direction.
91.1613.9.7.1. Diaphragm Defined.
shall be designed as a diaphragm.
Every floor level below the base level diaphragm
91.1613.9.7.2. Design Force. Each diaphragm below the base level diaphragm shall
be designed for all tributary loads at that level using a minimum seismic force factor not
less than the base shear coefficient.
91.1613.9.7.3. Design Force Resistance-Primary
Anchors. The design force
described in Section 91.1613.9.7.2 shall be resisted through primary anchors from
diaphragm struts provided in each diaphragm to the foundation. Primary anchors shall
be provided and designed in accordance with the requirements and limitations of
Section 91.1613.8.5.
91.1613.9.7.4.
Design Force Resistance-Secondary
Anchors.
91.1613.9.7.4.1. General. In addition to the primary anchors required in
Section 91.1613.8.7.3, the design force in the downhill direction shall be resisted
through secondary anchors in the uphill foundation connected to diaphragm struts in
each diaphragm below the base level.
EXCEPTION: Secondary anchors are not required where foundations
extending in the downhill direction, spaced at not more than 30 feet (9144 mm)
on center, extend up to and are directly connected to each diaphragm below the
base level for at least 70% of the diaphragm depth.
91.1613.9.7.4.2. Secondary Anchor Capacity. Secondary anchors at each
diaphragm below the base level diaphragm shall be designed for a minimum force equal
to the design force but not less than 300 pounds per lineal foot (4.38 kN/m). The
secondary anchors shall be uniformly distributed along the uphill diaphragm edge and
shall be spaced a maximum offour feet (1219 mm) on center.
91.1613.9.7.4.3. Design. Secondary anchors and diaphragm struts shall be designed
in accordance with Section 91.1613.9.8.
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91.1613.9.8. Primary and Secondary Anchorage and Diaphragm Strut Design.
Primary and secondary anchors and diaphragm struts shall be designed in accordance
with the following provisions:
1.
Fasteners. All bolted fasteners used to develop connections to
wood members shall be provided with square plate washers at all bolt heads and
nuts. Washers shall be a minimum 0.229 inch by 3 inches by 3 inches (5.82 mm
by 76 mm by 76 mm) in size. Nuts shall be tightened to finger tight plus one-half
(1/2) wrench turn prior to covering the framing.
2.
Fastening. The diaphragm to foundation anchorage shall not be
accomplished by the use of toenailing, nails subject to withdrawal, or wood in
cross-grain bending or cross-grain tension.
3.
Size of Wood Members. Wood diaphragm struts collectors, and
other wood members connected to primary anchors shall not be less than threeinch (76 mm) nominal width. The effects of eccentricity on wood members shall
be evaluated as required per Item 9.
4.
Design. Primary and secondary anchorage, including diaphragm
struts, splices, and collectors shall be designed for 125% of the tributary force.
5.
Allowable Stress Increase. The allowable stress increase
permitted under Section 1605.3.2 shall not be taken when the working
(allowable) stress design method is used.
6.
Steel Element of Structural Wall Anchorage System. The
strength design forces for steel elements of the structural wall anchorage system,
with the exception of anchor bolts and reinforcing steel,shall be increased by 1.4
times the forces otherwise required.
7.
Primary Anchors. The load path for primary anchors and
diaphragm struts shall be fully developed into the diaphragm and into the
foundation. The foundation must be shown to be adequate to resist the
concentrated loads from the primary anchors.
8.
Secondary Anchors. The load path for secondary anchors and
diaphragm struts shall be fully developed in the diaphragm but need not be
developed beyond the connection to the foundation.
9.
Symmetry. All lateral force foundation anchorage and diaphragm
strut connections shall be symmetrical. Eccentric connections may be permitted
when demonstrated by calculation or tests that all components of force have
been provided for in the structural analysis or tests.
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10.
Wood Ledgers. Wood ledgers shall not be used to resist crossgrain bending or cross-grain tension.
91.1613.9.9.
Lateral-Foree-Resisting
Elements
Normal to the Down hill Direction.
91.1613.9.9.1. General. In the direction normal to the downhill direction, lateral-forceresisting elements shall be designed in accordance with the requirements of this
section.
91.1613.9.9.2. Base Shear. In developing the base shear for seismic design, the
response modification coefficient (R) shall not exceed 5 for bearing wall and building
frame systems.
91.1613.9.9.3. Vertical Distribution of Seismic Forces. For seismic forces acting
normal to the downhill direction, the distribution of seismic forces over the height of the
building using Section 12.8.3 of ASCE 7 shall be determined using the height measured
from the top of the lowest level of the building foundation.
91.1613.9.9.4. Drift Limitations.
The story drift below the base level diaphragm shall
not exceed 0.007 times the story height at strength design force level. The total drift
from the base level diaphragm to the top of the foundation shall not exceed 3/4 inch (19
mm). Where the story height or the height from the base level diaphragm to the top of
the foundation varies because of a stepped footing or story offset, the height shall be
measured from the average height of the top of the foundation. The story drift shall not
be reduced by the effect of horizontal diaphragm stiffness.
91.1613.9.9.5.
Distri bution of Lateral Forces.
91.1613.9.9.5.1. General. The design lateral force shall be distributed to lateral-forceresisting elements of varying heights in accordance with the stiffness of each individual
element.
91.1613.9.9.5.2. Wood Structural Panel Sheathed Walls. The stiffness of a stepped
wood structural panel shear wall may be determined by dividing the wall into adjacent
rectangular elements, subject to the same top of wall deflection. Deflections of shear
walls may be estimated by AF&PA SDPWS Section 4.3.2. Sheathing and fastening
requirements for the stiffest section shall be used for the entire wall. Each section of
wall shall be anchored for shear and uplift at each step. The minimum horizontal length
of a step shall be 8 feet (2438 mm) and the maximum vertical height of a step shall be
2 feet, 8 inches (813 mm).
91.1613.9.9.5.3. Reinforced Concrete or Masonry Shear Walls. Reinforced
concrete or masonry shear walls shall have forces distributed in proportion to the rigidity
of each section of the wall.
19
91.1613.9.9.6. Limitations. The following lateral force-resisting-elements shall not be
designed to resist lateral forces below the base level diaphragm in the direction normal
to the downhill direction:
1.
Cement plaster and lath;
2.
Gypsum wallboard; and
3.
Tension-only braced frames.
Braced frames designed in accordance with the requirements of
Section 2205.2.2 of this Code may be designed as lateral-force-resisting
elements in the direction normal to the downhill direction, provided lateral forces
do not induce flexural stresses in any member of the frame. Deflections of
frames shall account for the variation in slope of diagonal members when the
frame is not rectangular.
91.1613.9.10.
Specific Design Provisions.
91.1613.9.10.1. Footings and Grade Beams. All footings and grade beams shall
comply with the following:
1.
Grade beams shall extend at least 12 inches (305 mm) below the
lowest adjacent grade and provide a minimum 24-inch (610 mm) distance
horizontally from the bottom outside face of the grade beam to the face of the
descending slope.
2.
Continuous footings shall be reinforced with at least two NO.4
reinforcing bars at the top and two No.4 reinforcing bars at the bottom.
3.
All main footing and grade beam reinforcement steel shall be bent
into the intersecting footing and fully developed around each corner and
intersection.
4.
All concrete stem walls shall extend from the foundation and
reinforced as required for concrete or masonry walls.
91.1613.9.10.2. Protection Against Decay and Termites. All wood to earth
separation shall comply with the following:
1.
Where a footing or grade beam extends across a descending
slope, the stem wall, grade beam, or footing shall extend up to a minimum 18
inches (457 mm) above the highest adjacent grade.
20
EXCEPTION: At paved garage and doorway entrances to the
building, the stem wall need only extend to the finished concrete slab,
provided the wood framing is protected with a moisture proof barrier.
2.
Wood ledgers supporting a vertical load of more than 100 pounds
per lineal foot (1.46 kN/m) and located within 48 inches (1219 mm) of adjacent
grade are prohibited. Galvanized steel ledgers and anchor bolts, with or without
wood nailers, or treated or decay resistant sill plates supported on a concrete or
masonry seat, may be used.
91.1613.9.10.3. Sill Plates. All sill plates and anchorage shall comply with the
following:
1.
All wood framed walls, including nonbearing walls, when resting on
a footing, foundation, or grade beam stem wall, shall be supported on wood sill
plates bearing on a level surface.
2.
Power-driven fasteners shall not be used to anchor sill plates
except at interior nonbearing walls not designed as shear walls.
91.1613.9.10.4. Column Base Plate Anchorage. The base of isolated wood posts
(not framed into a stud wall) supporting a vertical load of 4,000 pounds (17.8 kN) or
more and the base plate for a steel column shall comply with the following:
1.
When the post or column is supported on a pedestal extending
above the top of a footing or grade beam, the pedestal shall be designed and
reinforced as required for concrete or masonry columns. The pedestal shall be
reinforced with a minimum of four NO.4 bars extending to the bottom of the
footing or grade beam. The top of exterior pedestals shall be sloped for positive
drainage.
2.
The base plate anchor bolts or the embedded portion of the post
base, and the vertical reinforcing bars for the pedestal, shall be confined with two
NO.4 or three No.3 ties within the top 5 inches (127 mm) of the concrete or
masonry pedestal. The base plate anchor bolts shall be embedded a minimum
of 20-bolt diameters into the concrete or masonry pedestal. The base plate
anchor bolts and post bases shall be galvanized and each anchor bolt shall have
at least two galvanized nuts above the base plate.
91.1613.9.10.5. Steel Beam to Column Supports. All steel beam to column supports
shall be positively braced in each direction. Steel beams shall have stiffener plates
installed on each side of the beam web at the column. The stiffener plates shall be
welded to each beam flange and the beam web. Each brace connection or structural
member shall consist of at least two 5/8 inch (15.9 mm) diameter machine bolts.
Sec. 37. Section 91 .1616 of the Los Angeles Municipal Code is deleted in its
entirety.
21
Sec. 38. The Title of Division 17 of Article 1, Chapter IX of the Los Angeles
Municipal Code is amended to read as follows:
ARTICLE 1, DIVISION 17
STRUCTURAL TESTS AND SPECIAL INSPECTIONS
Sec. 39. Subsection 91.1702.1 of the Los Angeles Municipal Code is amended
to read as follows:
91.1702.1.
Reserved.
Sec. 40. A new Subsection 91.1703.6.1 is added to the Los Angeles Municipal
Code to read as follows:
91.1703.6.1. Follow-up Inspection. The applicant shall provide for special inspections
of fabricated items in accordance with Section 1704.2.5.
Sec. 41. Section 91.1704 of the Los Angeles Municipal Code is amended to
read as follows:
SEC. 91.1704. SPECIAL INSPECTIONS.
Section 1704 of the CSC is adopted by reference, except that Sections 1704.2,
1704.2.1,1704.2.3,1704.2.4,1704.2.5.1,
1704.2.5.2, 1704.3,1704.3.1, 1704.4, 1704.5,
1704.5.1,1704.5.2,1704.7,1704.8
and 1704.9 of the CSC are not adopted; and, in lieu,
Subsections 91.1704.2, 91.1704.2.1, 91.1704.2.1.1, 91.1704.2.1.1.2, 91.1704.2.1.3,
91.1704.2.3, 91.1704.2.4, 91.1704.3, 91.1704.3.1, 91.1704.4, 91.1704.4.1.1,
91.1704.4.1.2,91.1704.4.1.3,
91.1704.4.1.4, 91.1704.4.1.5, 91.1704.4.1.6, 91.1704.5,
91.1704.5.1 and 91.1704.5.1.2 are added or amended, respectively, to read as follows:
Sec. 42. Subsections 91.1704.1 through and including 91.1704.1.4.2 of the
Los Angeles Municipal Code are deleted in their entirety.
Sec. 43. A new Subsection 91.1704.2 of the Los Angeles Municipal Code is
added to read as follows:
91.1704.2. Special Inspections. Where application is made for construction as
described in this section, the owner or the registered design professional in responsible
charge acting as the owner's agent shall employ one or more Deputy Inspectors to
perform inspections during construction on the types of work listed under Section 1705.
The Registered Deputy Inspector shall be a qualified person as set forth in
Section 91.1704.1.3 and shall demonstrate competence to the satisfaction of the
Superintendent of Building for inspection of the particular type of construction or
operation requiring special inspection. The Registered Deputy Inspector shall be
22
approved by and shall be responsible, to the registered design professional in charge of
the design of the structure.
The special inspections shall be in addition to the inspections made by the
employees of the department as set forth in Section 110 of this Code.
All special inspections shall be made by a Registered Deputy Inspector.
Whenever the term "Special Inspector" is used in this Code, it shall mean "Registered
Deputy Inspector" as described in Section 1704.2.1 of this Code.
EXCEPTIONS:
1.
Special inspections are not required for construction of a minor
nature or as warranted by conditions in the jurisdiction as approved by the
Superintendent of Building.
2.
Unless otherwise required by the Superintendent of Building,
special inspections are not required for Group U occupancies that are accessory
to a residential occupancy including, but not limited to, those listed in
Section 312.1.
3.
Special inspections are not required for portions of structures
designed and constructed in accordance with the cold-formed steel light-frame
construction provisions of Section 2211.7 or the conventional light-frame
construction provisions of Section 2308.
91.1704.2.1. Registered Deputy Inspector Qualifications. An applicant for Deputy
Inspector shall provide written documentation to the Superintendent of Building
demonstrating his or her competence and relevant experience or training. Experience
or training shall be considered relevant when the documented experience or training is
related in complexity to the same type of special inspection activities for projects of
similar complexity and material qualities. These qualifications are in addition to
qualifications specified in other sections of this Code.
Application for registration as a Registered Deputy Inspector shall be made to the
Superintendent of Building on a form furnished by the Department. A separate
application shall be made for each type of registration desired. Registration is available
for the following types of inspections: Reinforced Concrete (RC), Structural Masonry
(SM), Structural SteellWelding (SSW), Grading (GO), Sprayed Fire resistant Materials
(SFRM), Methane Barrier (MB) and Wood (WD).
A committee appointed by the Superintendent of Building shall examine each
applicant as to his or her experience and training for performing the duties of an
inspector of the type for which application has been made. Additionally, the applicant
will be examined on the applicant's knowledge of the Los Angeles Municipal Code and
Register Deputy Inspector duties, responsibilities and procedures. When satisfied as to
23
the fitness of the applicant, the Superintendent of Building shall issue a Certificate of
Registration. Upon application for renewal of a Certificate of Registration, the applicant
shall be re-examined to ascertain the applicant's fitness to perform the duties of
inspector of the type for which application has been made.
EXCEPTION: If the Department determines that the initial examination
(which includes general knowledge, code requirements and plan comprehension)
for the special inspector program under the International Code Council (ICC) is
equivalent to the above-described initial or renewal examination, then the
Department may accept the results of the ICC examination in lieu of the
Department's examination in that category; however, the Department will be
examining the applicant's knowledge of the Los Angeles Municipal Code and
deputy inspector duties, responsibilities and procedures.
The Superintendent of Building shall issue a separate Certificate of Registration
for each type of registration requiring special inspection in accordance with
Sections 91.1704 and 91.1707 of this Code and as determined by the Superintendent of
Building for any construction requiring either continuous or periodic special inspection.
Nothing here shall be deemed to prohibit anyone person from being qualified for
more than one type of special inspection, provided he or she applies, pays the required
fees, takes the required examinations and is duly qualified by the Superintendent of
Building for each type.
Each Certificate of Registration shall expire three (3) years from the date of
issuance, but may be renewed by the Superintendent of Building within a grace period
of thirty (30) days thereafter.
The Department shall maintain a list of the names of all Registered Deputy
Inspectors, showing the type of work each has been authorized to inspect. This list
shall be available to the public.
Upon evidence satisfactory to the Superintendent of Building of incompetence, of
willful or negligent failure to observe or report violations of this Code, or of any other
failure to perform properly and effectively the duties assumed by a Registered Deputy
Inspector, the Superintendent of Building may revoke, suspend or refuse to renew any
Certificate of Registration. But, prior to that action, the holder shall be given an
opportunity to appear before the Superintendent of Building and be heard.
Except where there is an employee of the City of Los Angeles inspecting
buildings or structures being erected or repaired by the City, no Registered Deputy
Inspector shall receive any compensation whatsoever from the City. A Registered
Deputy Inspector shall undertake and perform the duties of inspection solely on the
request of the owner or the owner's agent. The designation shall be deemed to indicate
that the duties incident to the inspection are within the course and scope of the
Registered Deputy Inspector's employment by the owner or agent, and except where
24
the Registered Deputy Inspector is in fact an employee of the City, the Registered
Deputy Inspector shall not be deemed an employee of the City, the contractor, a
subcontractor or a material vendor for any purpose.
The registered design professional in responsible charge and engineers of record
involved in the design of the project are permitted to act as the supervising agency and
their personnel are permitted to act as the deputy inspector for the work designed by
them, provided they qualify as deputy inspectors.
91.1704.2.1.1.
Duties and Responsi bilities of the Registered Deputy Inspector.
1.
The Registered Deputy Inspector employed on any work must be
present during the execution of all the work the Registered Deputy Inspector has
undertaken to inspect. The Registered Deputy Inspector shall notify the
Department of the commencement of inspection of a job and shall specify the
type of inspection for which the Registered Deputy Inspector has been engaged.
This notification shall be made no later than the last working day preceding the
commencement of inspection. The Registered Deputy Inspector shall report to
the job sufficiently in advance of construction to review the plans and to inspect
all materials to be used or concealed within the work, shall inspect the
construction, erection, placing or other use of the materials, and shall observe
whether there is compliance with the Code as to all of the foregoing. During the
execution of the work, the Registered Deputy Inspector shall not undertake or
engage in any other task or occupation that will interfere with the proper
performance of his or her duties relating to the inspections. The Registered
Deputy Inspector shall report, as directed, to the Superintendent of Building,
noting all violations of this Code that have occurred and any other information as
may be required. At the conclusion of the Registered Deputy Inspector's duties
on any project, which has been completed in accordance with this Code, the
Registered Deputy Inspector shall submit a report to the Department setting forth
the portion of the work inspected. The report shall be made on forms supplied by
the Department and shall be filed in the records of the Department.
2.
Nothing here shall be deemed to authorize any Registered Deputy
Inspector to approve any inspection required by this Code, other than the special
inspection for which the Registered Deputy Inspector was hired.
3.
Where, in the opinion of the Department, the magnitude or
complexity of a job warrants it, additional Registered Deputy Inspectors may be
required.
4.
Where, in the opinion of the Department, the Registered Deputy
Inspector is negligent in the performance of the Deputy Inspector's duties, the job
shall be stopped.
25
5.
Nothing herein shall be deemed to authorize any Registered
Deputy Inspector to approve the pouring of concrete, the placement of masonry,
structural steel or fill prior to the approval of the regular building inspector.
91.1704.2.1.2.
Fees for Registered
Deputy Inspector.
1.
New Application.
Before accepting any application for registration
as a Registered Deputy Inspector, the Department shall collect a new
examination fee of $528. A separate application shall be submitted and a
separate examination fee shall be collected for each additional type of
registration desired. When the applicant passes the examination(s), a
Certificate(s) of Registration for each type of examination passed shall be issued.
If the applicant fails to pass an examination, the applicant may reapply and again
pay the examination fees. No refund(s) will be given to the applicant after the
Department has administered the examination(s).
2.
Renewal Application.
Before renewing a Certificate of
Registration as a Registered Deputy Inspector, the Department shall collect a
renewal Registration and examination fee in the amount of $482. A separate
application shall be submitted and a separate examination fee shall be collected
for each additional type of renewal registration desired. When the applicant
passes the examination(s), a Certificate(s) of Registration for each type of
examination passed shall be issued. If the applicant fails to pass the
examination(s), the applicant may reapply; however, the applicant must again
pay the renewal Registration and examination fees before the Department can
issue the Certificate of Registration(s). No refund(s) will be given to applicant
after the Department has administered the examination.
3.
International Code Council (ICC) Certification(s).
International
Code Council (ICC) Certification(s) is required prior to taking the Department's
new or renewal examination(s). In addition to ICC's certification, the
Department's examination will be required for each type of registration and fees
collected as specified in this Section.
EXCEPTIONS:
If the ICC does not have an examination for a Department registration, the
applicant will be required to take the Department examination only.
The ICC Certification may not be required when the Department
registration is utilized by the Department of Public Works for City business only.
91.1704.2.1.3. Failure to Pass Examination for Registered Deputy Inspector.
Every applicant who fails to pass a new or renewal exarnination(s) shall not be eligible
for re-examination until 30 days after taking the previous examination.
26
Sec. 44. Subsection 91.1704.2.2 of the Los Angeles Municipal Code is deleted
in its entirety.
Sec. 45. A new Subsection 91.1704.2.3 is added to the Los Angeles Municipal
Code to read as follows:
91.1704.2.3. Statement of Special Inspections.
The permit applicant shall submit a
statement of special inspections in accordance with Section 107.1 of this Code. The
statement of special inspections shall be prepared by the registered design professional
in responsible charge as a condition for permit issuance. This statement shall be in
accordance with Section 1704.3.
EXCEPTIONS:
1.
A statement of special inspections is not required for portions of
structures designed and constructed in accordance with the cold-formed steel
light-frame construction provisions of Section 2211.7 or the conventional lightframe construction provisions of Section 2308.
2.
The statement of special inspections is permitted to be prepared by
a qualified person approved by the Superintendent of Building for construction,
not designed by a registered design professional.
Sec. 46. A new Subsection 91.1704.2.4 is added to the Los Angeles Municipal
Code to read as follows:
91.1704.2.4. Report Requirement. In addition to all the requirements of
Section 91.1704.1.4, Registered Deputy Inspectors shall keep records of inspections.
The Registered Deputy Inspector shall furnish inspection reports to the Superintendent
of Building, and to the registered design professional in responsible charge. Reports
shall indicate that work inspected was or was not completed in conformance to
approved construction documents. Discrepancies shall be brought to the immediate
attention of the contractor for correction. If they are not corrected, the discrepancies
shall be brought to the attention of the Superintendent of Building and to the registered
design professional in responsible charge prior to the completion of that phase of the
work. A final report documenting required special inspections and correction of any
discrepancies noted in the inspections shall be submitted at a point in time agreed upon
prior to the start of work by the permit applicant and the Superintendent of Building prior
to the start of work.
Sec. 47. A new Subsection 91.1704.2.5.1 is added to the Los Angeles Municipal
Code to read as follows:
91.1704.2.5.1. Fabrication and Implementation Procedures. The deputy inspector
shall verify that the fabricator maintains detailed fabrication and quality control
procedures that provide a basis for inspection control of the workmanship and the
27
fabricator's ability to conform to approved construction documents and referenced
standards. The deputy inspector shall review the procedures for completeness and
adequacy relative to the Code requirements for the fabricator's scope of work.
EXCEPTION: Special inspections as required by Section 1704.2.5 shall
not be required where the fabricator is approved in accordance with
Section 1704.2.5.2.
Sec. 48. A new Subsection 91.1704.2.5.2 is added to the Los Angeles Municipal
Code to read as follows:
91.1704.2.5.2. Fabricator Approval. Pursuant to LAMC Section 96.200, special
inspections required by Section 1705 are not required where the work is done on the
premises of a fabricator registered and approved to perform such work without special
inspection. The Department shall base approval upon review of the fabricator's written
procedural and quality control manuals and periodic auditing of fabrication practices. At
completion of fabrication, the approved fabricator shall submit a certificate of
compliance to the Superintendent of Building stating that the work was performed in
accordance with the approved construction documents.
Sec. 49. A new Subsection 91.1704.3 is added to the Los Angeles Municipal
Code to read as follows:
91.1704.3. Statement of Special Inspections. Where special inspection or testing is
required by Section 1705, the registered design professional in responsible charge shall
prepare a statement of special inspections in accordance with Section 1704.3.1 for
submittal by the applicant in accordance with Section 1704.2.3.
EXCEPTION: The statement of special inspections is permitted to be
prepared by a qualified person approved by the Superintendent of Building for
construction not designed by a registered design professional.
91.1704.3.1. Content of Statement of Special Inspections.
inspections shall identify the following:
The statement of special
1.
The materials, systems, components and work required to have
special inspection or testing by the Superintendent of Building or by the
registered design professional responsible for each portion of the work.
2.
The type and extent of each special inspection.
3.
The type and extent of each test.
4.
Additional requirements for special inspection or testing for seismic
or wind resistance as specified in Sections 1705.10, 1705.11 and 1705.12.
28
5.
For each type of special inspection, identification as to whether it
will be continuous special inspection or periodic special inspection.
Sec. 50. Subsections 91.1704.3.1.1 through and including 91.1704.3.1.3 of the
Los Angeles Municipal Code are deleted in their entirety.
Sec. 51. Subsection 91.1704.4 of the Los Angeles Municipal Code is amended
to read as follows:
91.1704.4.
Contractor Responsibility.
Each contractor responsible for the
construction of a main wind- or seismic force-resisting system, designated seismic
system or a wind- or seismic-resisting component listed in the statement of special
inspections shall submit a written statement of responsibility to the Superintendent of
Building and the owner prior to the commencement of work on the system or
component. The contractor's statement of responsibility shall contain acknowledgement
of awareness of the special requirements contained in the statement of special
inspection.
Sec. 52. A new Subsection 91.1704.4.1 is added to the Los Angeles Municipal
Code to read as follows:
91.1704.4.1.
Certified
Licensed
Contractors.
91.1704.4.1.1.
Reg istration. Application for reg istration as a certified licensed
contractor shall be made to the Superintendent of Building on a form furnished by the
Department and a separate application shall be made for each type of registration
desired. Before the application can be accepted, the applicant must furnish proof
satisfactory to the Department that the applicant holds a valid active California State
Contractor's License in the same specialty as the certification requested.
91.1704.4.1.2.
Appl ication.
1.
Form. Application for a Certificate of Registration shall be made on
a form furnished by the Department.
2.
Information Necessary. The application shall bear the name and
address of the applicant and, if the applicant is employed by a firm, partnership
or corporation, the names of the principal officers should also be included. The
application shall carry other information deemed necessary by the Department.
3.
Verification.
The applicant shall declare that the information
contained in the application is true and correct.
4.
Fee. The application shall be accompanied by an examination fee
of$188.
29
91.1704.4.1.3.
Exam ination.
1.
Examination Required. Before issuance of a Certificate of
Registration, the applicant shall have successfully passed the examination
required for the issuance of the Certificate of Registration within ninety (90) days
preceding the date of the issuance. To be eligible for the examination for a
Certificate of Registration, the applicant shall have a valid California State
Contractor's License in an appropriate specialty and a valid City Business Tax
Ce rtificate.
2.
Board of Examiners. The Superintendent of Building and/or
Board of Examiners composed of three qualified persons appointed by the
Superintendent shall conduct examinations. The results of every examination
shall be subject to the approval of the Superintendent of Building. Each
examiner shall serve at the pleasure of the Superintendent of Building and shall
serve for a period of one year unless re-appointed by the Superintendent.
3.
Scope of Examination. The examination shall, in the judgment of
the Superintendent of Building, fairly determine the ability of the applicant to
perform properly the work, which he or she would be authorized to do by the
Certificate of Registration requested, and may include the following:
a.
A written test.
b.
Practical tests as may be required.
c.
An oral interview as may be required.
d.
Other tests as may be required by the Board of Examiners.
4.
Time of Examination. The applicant shall be examined as soon
as practicable after filing an application.
5.
Rules and Regulations. The Department shall have the authority
to establish rules and regulations for the conduct of examinations.
6.
Fitness of Applicant. Any applicant may be required to submit
satisfactory proof of his or her fitness to carry out the intent of this Code.
7.
Failure to Pass. An applicant who fails to pass an examination
shall not be eligible for another examination until four (4) weeks after taking the
previous examination.
30
91.1704.4.1.4.
Issuance of Certificates.
1.
The Superintendent of Building shall issue separate Certificates of
Registration for each of the following categories:
a.
FAU/AC units; evaporative coolers.
b.
Domestic water piping/plumbing fixtures/hot water
heaters/solar panels.
c.
Reroofing and roof repair.
d.
Electrical equipment/fixtures/smoke
e.
Masonry and concrete fences.
f.
Masonry chimney repairs.
g.
Shower pan replacement.
detectors.
Nothing here prohibits any person from being qualified for more than one type of
certification, provided the person makes application, pays the required fees, takes the
required examinations and is duly qualified by the Superintendent of Building for each
type of certification.
2.
Upon payment of a $45 fee, the Department may issue a Certificate
of Registration to every applicant who passes the required examination for a
Certified Licensed Contractor.
3.
Each Certificate of Registration shall expire twelve (12) months
from the date of issuance.
4.
The Superintendent of Building shall keep on file a list, open to
public inspection, of the names of all registered certified licensed contractors,
showing the type of work each has been authorized to inspect.
5.
Renewal of Certificates. Expired Certificates of Registration may
be renewed at any time within thirty (30) days following the date of expiration.
After a Certificate of Registration has been expired for thirty (30) days, it may not
be renewed; rather, a new application for a new certificate must be submitted at
that time.
31
91.1704.4.1.5.
Exhibition of Certificate.
1.
Every person having a fixed place of business shall keep his or her
Certificate of Registration posted in some conspicuous location at his or her
place of business during the time the certificate is in force.
2.
Every person not having a fixed place of business shall carry his or
her Certificate of Registration with him or her at all times while doing any
inspections or other work pursuant to this certificate.
91.1704.4.1.6. Revocation of Certificate. The Superintendent of Building may
revoke, suspend or refuse to renew any Certificate of Registration upon a showing of
incompetence, willful or negligent failure to observe or report violations of this Code, or
failure to maintain a valid active California State Contractor's License in the same
specialty as the certification. Prior to any action, the holder shall be given an
opportunity to appear before the Superintendent of Building and be heard.
Suspension or revocation of any Certificate of Registration issued under this
Section shall be in accordance with the provisions of Article 8, Chapter IX of the Los
Angeles Municipal Code.
Sec. 53. A new Subsection 91.1704.5 is added to the Los Angeles Municipal
Code to read as follows:
91.1704.5. Structural Observations. Where required by the provisions of
Section 1704.5.1 or 1704.5.2, the owner shall employ the registered design professional
in responsible charge for the structural design, or another registered design professional
designated by the registered design professional in responsible charge for the structural
design to perform structural observations as defined in Section 1702.
Prior to the commencement of observations, the structural observer shall submit
to the Superintendent of Building a written statement identifying the frequency and
extent of structural observations.
The owner or owner's representative shall coordinate and call a preconstruction
meeting between the engineer or architect responsible for the structural design,
structural observer, contractor, affected subcontractors and deputy inspectors. The
structural observer shall preside over the meeting. The purpose of the meeting shall be
to identify the major structural elements and connections that affect the vertical and
lateral load systems of the structure and to review scheduling of the required
observations. A record of the meeting shall be included in the first report submitted to
the Superintendent of Building.
Observed deficiencies shall be reported, in writing, to the owner's representative,
Registered Deputy Inspector, contractor and the Superintendent of Building. Upon the
form prescribed by the Superintendent of Building, the structural observer shall submit
32
to the Superintendent of Building a written statement at each significant construction
stage stating that the site visits have been made and identify any reported deficiencies
which, to the best of the structural observer's knowledge, have not been resolved. A
final report by the structural observer, which states that all observed deficiencies have
been resolved, is required before acceptance of the work by the Superintendent of
Building.
91.1704.5.1. Structural
Observations for Seismic Resistance. Structural
observations shall be provided for those structures assigned to Seismic Design
Category D, E or F where one or more of the following conditions exist:
1.
The structure is classified as Risk Category III or IV in accordance
with Table 1604.5.
2.
The height of the structure is greater than 75 feet (22 860 mm)
above the base.
3.
The structure is assigned to Seismic Design Category E, is
classified as Risk Category lor II in accordance with Table 1604.5, and is greater
than two stories above grade plane and a lateral design is required for the
structure or portion thereof.
EXCEPTION: One-story wood framed Group R-3 and Group U
Occupancies less than 2000 square feet in area, provided the adjacent grade is
not steeper than 1 unit vertical in 10 units horizontal (10% sloped), assigned to
Seismic Design Category D.
4.
When so designated by the registered design professional
responsible for the structural design.
5.
When such observation is specifically required by the Department.
91.1704.5.2. Structural
Observations for Wind Requirements.
Structural
observations shall be provided for those structures sited where Vasd as determined in
accordance with Section 1609.3.1 exceeds 110 mph (49 m/sec), where one or more of
the following conditions exist:
1.
The structure is classified as Risk Category III or IV in accordance
with Table 1604.5.
2.
The building height of the structure is greater than 75 feet (22 860
mm).
3.
When so designated by the registered design professional
responsible for the structural design.
33
4.
When such observation is specifically required by the
Superintendent of Building.
Sec. 54. Subsections 91.1704.7 through and including 91.1704.22.2 of the
Los Angeles Municipal Code are deleted in their entirety.
Sec. 55. Section 91.1705 of the Los Angeles Municipal Code is amended to
read as follows:
SEC. 91.1705.
REQUIRED VERIFICATION
AND INSPECTION.
Section 1705 of the CBC is adopted by reference, except Sections 1705.1.1,
1705.2.2.1.1,1705.2.2.2,1705.3,1705.3.1,
1705.6, 1705.7, 1705.8, 1705.11,
1705.11.1, 1705.11.4, 1705.12.2, 1705.16.2,1705.17 of the CBC are not adopted; and,
in lieu, Subsections 91.1705.1.1, 91.1705.1.2, 91.1705.1.3, 91.1705.1.4, 91.1705.1.5,
91.1705.1.6,91.1705.1.7,91.1705.1.8,
91.1705.1.9, 91.1705.1.10,91.1705.1.11,
91.1705.2.2.1.1, 91.1705.2.2.1.2, 91.1705.2.2.1.3, 91.1705.2.2.1.3.1, 91.1705.2.2.1.3.2,
91.1705.2.2.2,91.1705.3,91.1705.3.1,
91.1705.3.2, 91.1705.6, 91.1705.6.1, 91.1705.7,
91.1705.8,91.1705.11,91.1705.11.1,
91.1705.11.4, 91.1705.12.2, 91.1705.16.2 and
91.1705.17 are added.
91.1705.1.1. Special Cases. Special inspections shall be requ ired for proposed work
that is, in the opinion of the Superintendent of Building, unusual in its nature, such as,
but not limited to, the following examples:
1.
Construction materials and systems that are alternatives to
materials and systems prescribed by this Code.
2.
Unusual design applications of materials described in this Code.
3.
Materials and systems required to be installed in accordance with
additional manufacturer's instructions that prescribe requirements not contained
in this Code or in standards referenced by this Code.
91.1705.1.2. Certifications
by Architect, Engineer or Geologist. If a structure or
portion of a structure has been designed to utilize higher stresses requiring continuous
inspection, the architect or engineer in charge of the design shall certify by signature to
the Department that to the best of his or her knowledge, the structure or portion utilizing
higher stresses was constructed in conformity with the approved design. If the grading
or foundation earthwork has required continuous inspection, the responsible
engineering geologist or soils engineer shall certify by signature to the Department that
to the best of his or her knowledge the field work was completed in conformity with the
technical design data.
91.1705.1.3. Department's Responsibility.
The employment of a Registered Deputy
Inspector for any work does not deprive the Department of the right to make periodic or
34
called inspections of all or portions of the work. On any work requiring continuous
inspection by a Registered Deputy Inspector, the called inspections required by Section
91.108 of this Code may be delegated to the Registered Deputy Inspector by the
Superintendent of Building.
91.1705.1.4. Structural, Termite and Fungus Damage. Every
foundation shall be inspected. If there is any superficial evidence
termites or fungus growth, the permittee shall remove and renew
infested members before reseating the building or moving it from
the City.
building raised from its
of structural damage,
the damaged or
its existing site or into
91.1705.1.5. Emergencies or Catastrophes.
In the event of an emergency or of a
major catastrophe in the City, the Department may deputize Emergency Building
Inspectors for the Department. The inspectors shall receive no compensation from the
City, and they shall be appointed for the periods of time the Department deems
advisable.
91.1705.1.6. Special Activity Inspection.
In add ition to the construction or work
inspected as described in Sections 91.108 and 91.1704 through 91.1705 of this Code,
there are other construction activities that are sufficiently important to the structural
stability of the structure, the occupants of and the fire and life safety of the structure that
inspection by a specially qualified inspector of these activities is necessary in order to
ensure compliance with the requirements of this Code. These special activity
inspections may occur during off-site fabrication or during on-site construction.
Inspections by Department Approved Special Activity Inspectors will be required
in accordance with regulations promulgated by the Superintendent of Building where:
1.
The structure is more than five stories or 60 feet (18,288 mm) in
height.
2.
The structure exceeds 50,000 square feet (4645 m2) of ground area
or 200,000 square feet (18 580 m2) of total floor area.
3.
Nondestructive structural testing methods are utilized.
4.
The quality identification markings of the materials used are not
inspectable after installation.
5.
installation.
The manner of use of materials precludes full inspection after
EXCEPTION: The Department may waive continuous or periodic
inspection required by this Section where minor quantities are involved and no
unusual hazards exist.
35
In addition to the projects included in the above categories, the Superintendent of
Building may require Special Activity inspections if the Superintendent determines that
these inspections are needed to ensure compliance with the provisions of this Code and
the work involves:
6.
Unique, novel or innovative construction;
7.
Highly complex or intricate construction;
8.
Unique, novel or innovative grading, earth support or foundation
procedures; or
9.
regulations.
New methods of construction not yet provided for in the rules and
Special Activity inspection authority will be determined on a case by case basis
and will require Deputy Inspector registration. The Superintendent of Building shall
adopt rules and regulations implementing the provisions of this Section, Theseregulations may establish and set the requirements for different types of Department
Approved Special Activity Inspectors.
91.1705.1.7.
Special Activity
Inspection
Authority.
91.1705.1.1.8. Registration.
The procedures
Special Activity Inspector shall be the same as
Inspector under Section 91.1704.2.1.2., except
inspection authority shall be as specified in the
Superintendent of Building.
and conditions of registration as a
applicable to a Registered Deputy
that the extent and duration of special
rules and regulations adopted by the
91.1705.1.9. Duties. Except as otherwise indicated by regulations promulgated by the
Superintendent of Building, the duties and responsibilities for a Special Activity
Inspector shall be the same as specified for a Registered Deputy Inspector under
Subsection 91.1704.2.1.1 of this Code.
91.1705.1.10. Fees. The procedures for the examination, registration and renewal of
authority as a Special Activity Inspector shall be the same as specified for Registered
Deputy Inspectors under Subsection 91.1704.1.3 of this Code.
91.1705.1.11. Renewal Process. Subsection 91.1704.1.3 applies to the application,
examination and renewal process for registration as a Special Activity Inspector.
Sec. 56. Subsection 91.1705.2 of the Los Angeles Municipal Code is deleted in
its entirety.
36
Sec. 57. Subsection 91.1705.2.2.1.1 of the Los Angeles Municipal Code is
added to read as follows:
91.1705.2.2.1.1. Cold-formed Steel. Welding inspection shall be performed by a
registered deputy inspector qualified by the Department for cold-formed steel floor and
roof decks. Welding shall be in accordance with AWS 01.3.
91.1705.2.2.1.2. Reinforcing Steel. Welding inspection shall be performed by a
registered deputy inspector qualified by the Department for reinforcing steel. Welding
shall be in accordance with AWS 01.4 and ACI 318.
91.1705.2.2.1.3.
Certification of Welders.
91.1705.2.2.1.3.1. The Department shall establish procedures, rules and regulations for
the issuance of Weider'S Certifications .
.A fee of $110 shall be paid on each application for certification or renewal. $50 of
the fee shall be paid prior to the Department's examination for a new certification and
the remaining amount shall be paid after the examination. Certificates shall be issued
for a period of three (3) years and may be renewed for an additional three (3) year
period.
91.1705.2.2.1.3.2. The Superintendent of Building shall suspend or revoke any
certificate upon evidence of failure of the person so certified to conduct welding
operations in compliance with any of the conditions upon which it is based, or where
quality of workmanship is not equivalent to that required by the Code, or for any of the
reasons set forth in Article 8, Chapter IX of the Los Angeles Municipal Code. Any action
shall be in accordance with the provisions of Article 8, Chapter IX of the Los Angeles
Municipal Code.
91.1705.2.2.2. Cold-formed Steel Trusses Spanning 60 Feet or Greater. Where a
cold-formed steel truss clear span is 60 feet (18 288 mm) or greater, the deputy
inspector shall verify that the temporary installation restrainUbracing and the permanent
individual truss member restrainUbracing are installed in accordance with the approved
truss submittal package.
Sec. 58. Subsection 91.1705.3 of the Los Angeles Municipal Code is amended
to read as follows:
91.1705.3. Concrete Construction. The special inspections and verifications for
concrete construction shall be as required by this section and Table 1705.3.
EXCEPTION:
Special inspections shall not be required for:
1.
Isolated spread concrete footings of buildings three stories or less
above grade plane that are fully supported on earth or rock, where the structural
37
design of the footing is based on a specified compressive strength, f' c, no
greater than 2,500 pounds per square inch (psi) (17.2 MPa).
2.
Continuous concrete footings supporting walls of buildings three
stories or less above grade plane that are fully supported on earth or rock where:
2.1.
The footings support walls of light-frame construction;
2.2.
The footings are designed in accordance with Table 1809.7;
or
2.3.
The structural design of the footing is based on a specified
compressive strength, f 'c, no greater than 2,500 pounds per square inch
(psi) (17.2 MPa), regardless of the compressive strength specified in the
construction documents or used in the footing construction.
3.
Nonstructural concrete slabs supported directly on the ground,
including prestressed slabs on grade, where the effective prestress in the
concrete is less than 150 psi (1.03 MPa).
4.
1807.1.6.2.
5.
Concrete foundation walls constructed in accordance with Table
Concrete patios, driveways and sidewalks on grade.
TABLE 1705.3 REQUIRED VERIFICATION AND INSPECTION OF CONCRETE
CONSTRUCTION
VERIFICATION
AND
INSPECTION
1. Inspection of
reinforcing
steel, including
prestressing
tendons, and
placement.
2. Inspection of
reinforcing steel
welding in
accordance
with Table
1705.2.2, Item
CONTINUOUS PERIODIC
REFERENCED
IBC
a
STANDARD
REFERENCE
-
X
ACI 318: 3.5,
7.1-7.7
1910.4
-
-
AWS 01.4
ACI 318: 3.5.2
-
ze.
38
3. Inspection of
anchors cast in
concrete where
allowable loads
have been
increased or
where strength
design is used.
-
X
ACI31B:
B.1.3, 21.2.B
190B.5,
1909.1
AC1318:
3.8.6,8.1.3,
21.2.8
1909.1
4. Inspection of
anchors postinstalled in
hardened
concrete
members".
-
X
5. Verifying use
of required
design mix.
-
X
6. At the time
fresh concrete
is sampled to
fabricate
specimens for
strength tests,
perform slump
and air content
tests, and
determine the
temperature of
the concrete.
7. Inspection of
concrete and
shotcrete
placement for
proper
application
techniques.
8. Inspection for
maintenance of
specified curing
temperature
and techniques.
ACI 318: Ch. 4,
5.2-5.4
1904.2,
1910.2,
1910.3
-
ASTM C 172
ASTM C 31
ACI 31B: 5.6,
5.8
1910.10
X
-
ACI 31B: 5.9,
5.10
1910.6,
1910.7,
1910.8
-
X
ACI 318: 5.115.13
1910.9
X
39
9. Inspection of
prestressed
concrete:
a.Application
of
prestressing
forces.
b.Grouting
of bonded
prestressing
tendons in
the seismic
forceresisting
system.
X
-
ACI 318: 18.20
AC1318:
18.18.4
-
X
10. Erection of
precast
concrete
members.
-
X
ACI 318: Ch.
16
-
11. Verification
of in-situ
concrete
strength, prior
to stressing of
tendons in posttensioned
concrete and
prior to removal
of shores and
forms from
beams and
structural slabs.
-
X
ACI 318: 6.2
-
12. Inspect
formwork for
shape, location
and dimensions
of the concrete
member being
formed.
-
X
ACI 318: 6.1.1
-
For SI: 1 inch = 25.4 mm.
a. Where applicable, see also Section 1705.11, Special inspections for seismic resistance.
b. Specific requirements for special inspection shall be included in the research report for the anchor
40
issued by an approved source in accordance with ACI 355.2 or other qualification procedures. Where
specific requirements are not provided, special inspection requirements shall be specified by the
registered design professional and shall be approved by the Superintendent of Building prior to the
commencement of the work.
91.1705.3.1. Structural Inspection Concrete. During the construction of all
buildings over 160 feet (48,768 mm) in height with concrete special moment-resisting
space frames, a structural inspector under the supervision of the engineer responsible
for the structural design shall be present to inspect the materials and workmanship for
conformance with approved plans, specifications and change orders involved in
construction of the ductile frames and shear walls. This inspection may be made by
one or more structural inspectors, provided that at least one structural inspector is
present during the placement of all concrete and reinforcement in the structural frame
and shear walls.
w
The number of structural inspectors to be provided for each structure shall be
determined by the engineer responsible for the structural design, provided that more
than one structural inspector shall be provided where the magnitude of a structure
prevents a single inspector from adequately performing the inspection.
The owner shall provide for each structural inspector. Each structural inspector
shall be paid by the owner directly or through the person responsible for the structural
design. Each structural inspector shall be responsible to the person who prepared the
structural design.
The inspection by the structural inspector or inspectors shall be in addition to
inspections made by Department employees as specified in Section 91.108 of this
Code and by Registered Deputy Inspectors as specified for other parts of the work in
Section 91.1704.1 this Code.
Prior to the issuance of the Certificate of Occupancy, each structural inspector
shall submit a report in writing to the engineer and the Department certifying that the
portions of the structural frame inspected by the inspector were constructed in
accordance with the approved plans, specifications, change orders and Division 19 of
this Code.
91.1705.3.2. Materials. In the absence of sufficient data or documentation provid ing
evidence of conformance to quality standards for materials in Chapter 3 of AC I 318, the
Superintendent of Building shall require testing of materials in accordance with the
appropriate standards and criteria for the material in Chapter 3 of ACI 318. Weldability
of reinforcement, except that which conforms to ASTM A 706, shall be determined in
accordance with the requirements of Section 3.5.2 of ACI 318.
91.1705.6. Soils. Special inspections defined per Sections 7008.2 and 7011.3 of this
Code for existing site soil conditions, fill placement and load-bearing requirements shall
be as required by this section and Table 1705.6. The approved geotechnical report,
and the construction documents prepared by the registered design professionals shall
41
be used to determine compliance. During fill placement, the special inspector shall
determine that proper materials and procedures are used in accordance with the
provisions of the approved geotechnical report, as specified in esc Section 1803.5.
EXCEPTION: Special inspection is not required during placement of
controlled fill having a total depth of 12 inches (305 mm) or less and where the
fill is not used for graded slopes or for support of footings or foundations.
91.1705.6.1. Grading. A registered Grading Inspector is required under all conditions
where the site grading or foundation earthwork planned on a project has any of the
following:
1.1.
A contiguous grading area exceeding 60,000 square feet (5574
1.2.
An excavated or filled slope steeper than 2 horizontal in 1 vertical
(50 percent slope).
1.3.
An excavated slope exceeding 40 feet (12,192 mm) in height and
the top of which is within 20 feet (6096 mm) of a property line coterminous with
improved private property or a public way.
1.4.
Foundation excavations below a 1 horizontal in 1 vertical plane
inward and down from the property line.
EXCEPTION: The department may waive continuous inspection
where minor areas or heights are involved and no unusual hazards exist.
TABLE 1705.6 REQUIRED VERIFICATION AND INSPECTION OF SOILS
VERIFICATION
AND
INSPECTION
TASK
1. Verify
materials below
shallow
foundations are
adequate to
achieve the
design bearing
capacity.
CONTINUOUS PERIODICALL Y
DURING
DURING TASK
TASK LISTED
LISTED
-
X
42
2. Verify
excavations are
extended to
proper depth
and have
reached proper
material.
-
X
3. Perform
classification
and testing of
compacted fill
materials.
-
X
4. Verify use of
proper
materials,
densities and lift
thicknesses
during
placement and
compaction of
compacted fill.
Xa
-
5. Prior to
placement of
compacted fill,
observe
subgrade and
verify that site
has been
prepared
properly.
-
X
a. Frequency of special inspections to be determined by the registered design professional responsible
for the project.
91.1705.7. Driven Deep Fou ndations and Connecting Grade Beams. Special
inspections shall be performed during installation and testing of driven deep foundation
elements as required by Table 1705.7. The approved geotechnical report, required by
esc Section 1803.2, and the construction documents prepared by the registered
design professionals in responsible charge, shall be used to determine compliance.
Special inspections for connecting grade beams shall be in accordance with
Section 91.1705.4 of this Code.
43
91.1705.8. Cast-in-PJace Deep Foundations and Connecting Grade Beams.
Special inspections shall be performed during installation and testing of cast-in-place
deep foundation elements as required by Table 1705.8. The approved geotechnical
report, required by Section 1803.3 and the construction documents prepared by the
registered design professionals in responsible charge, shall be used to determine
compliance. Special inspections for connecting grade beams shall be in accordance
with Section 91.1705.4 of this Code.
91.1705.11.1. Structural Steel. Special inspection for structu ral steel shall be in
accordance with the quality assurance requirements of AISC 341 and during the
fabrication and erection of buildings over 160 feet (48,768 mm) in height with structural
steel moment-resisting frames. A Registered Deputy Inspector under the supervision of
the engineer responsible for the structural design shall be present during the
performance of all structural welding or the installation of all high-strength bolts whether
in a fabricator's shop or at the job site.
EXCEPTIONS:
1.
Single-pass fillet welds not exceeding 5/16-inch (7.9 mm) in size.
2.
Floor and roof deck welding.
91.1705.11.1.1. Certification. For buildings exceeding 160 feet (48,768 mm) in
height, the engineer responsible for the structural design and the general contractor
responsible for the construction, or their competent authorized representatives, shall
make periodic inspections of the work at the site to verify general compliance with the
approved plans, specifications and change orders. The engineer and general
contractor shall submit a statement in writing to the Department stating that they know
from personal knowledge that the materials installed and the structural work performed
is in compliance with the approved plans, specifications and change orders.
The phrase "personal knowledge" as used above in reference to the engineer
and general contractor means the knowledge resulting from the general observation by
the engineer and the general supervision by the contractor of the work, as required by
both in the superintendence of the building's construction, and as distinguished from
the continuous personal superintendence of the special inspector and/or deputy
inspector who are continuously at the site during the progress of the work. The
exercise of reasonable diligence to obtain the facts is required and anyone who
intentionally remains unaware may be charged with knowledge. The interpretation of
personal knowledge as it applies to the special inspector and/or deputy inspector is that
the inspector(s) must have actual personal knowledge that the requirements of the
plans and specifications are being carried out, which is obtained by the inspector's
continuous observation of the work of construction at the site in all stages of its
progress.
44
EXCEPTION: Special inspections of structural steel in structures
assigned to Seismic Design Category C that are not specifically detailed for
seismic resistance, with a response modification coefficient, R, of 3 or less,
excluding cantilever column systems.
91.1705.11.4. Designated Seismic Systems Verifications. The deputy inspector
shall examine designated seismic systems requiring seismic qualification in accordance
with Section 1705.12.3 and verify that the label, anchorage or mounting conforms to the
certificate of compliance and any applicable research report.
91.1705.12.2. Structural Steel. Testing for structural steel shall be in accordance with
the quality assurance requirements of AISC 341 and the additional requirements in this
Section. Nondestructive testing shall be performed by an approved agency and the
written report, including the test results, shall be submitted for evaluation by the
Superintendent of Building. The acceptance criteria for nondestructive testing shall be
as required in AWS 01.1 as specified by the registered design professional.
Base metal thicker than 1.5 inches (38 mm), where subject to through-thickness
weld shrinkage strains, shall be ultrasonically tested for discontinuities behind and
adjacent to those welds after joint completion. Any material discontinuities shall be
accepted or rejected on the basis of ASTM A 435 or ASTM A 898 (Level 1 criteria) and
criteria as established by the registered design professional(s) in responsible charge,
and the construction documents.
EXCEPTION: Testing for structural steel in structures assigned to
Seismic Design Category C that are not specifically detailed for seismic
resistance, with a response modification coefficient, R, of 3 or less, excluding
cantilever column systems.
91.1705.16.2. Fire-Resistant Joint Systems. Inspection of fire-resistant joint systems
that are tested and listed in accordance with Sections 715.3 and 715.4 shall be
conducted by an approved deputy inspector in accordance with ASTM E 2393.
91.1705.17. Special Inspection for Smoke Control. Smoke control systems shall be
tested by a deputy inspector.
Sec. 58. A new Section 91.1706 is added to the Los Angeles Municipal Code to
read as follows:
SEC. 91.1706. DESIGN STRENGTHS OF MATERIALS
Section 1706 of the CBC is adopted by reference, except Section 1706.1 of the
CBC is not adopted and in lieu, Subsection 91.1706.1 is added.
45
91.1706.1.
Conformance
to Standards.
The design strengths and permissible stresses of any structural material that are
identified by a manufacturer's designation as to manufacture and grade by mill tests, or
the strength and stress grade is otherwise confirmed to the satisfaction of the
Superintendent of Building shall conform to the specifications and methods of design of
accepted engineering practice or the approved rules in the absence of applicable
standards.
Sec. 59. Section 91.1707 of the Los Angeles Municipal Code is amended to
read as follows:
SEC. 91.1707. SPECIAL INSPECTIONS FOR SEISMIC RESISTANCE.
Section 1707 of the CBC is adopted by reference, except Sections 1707.1 of the
CBC is not adopted and in lieu Subsection 91.1707.1 is added.
91.1707.1. General. In the absence of approved rules or other approved standards,
the Superintendent of Building shall make, or cause to be made, any necessary tests
and investigations; or the Superintendent of Building shall accept duly authenticated
reports from approved agencies in respect to the quality and manner of use of new
materials or assemblies as provided for in Section 104.11. The cost of all tests and
other investigations required under the provisions of this Code shall be borne by the
applicant.
Sec. 60. Subsections 91.1707.2 through and including 91.1707.10 of the
Los Angeles Municipal Code are deleted in their entirety.
Sec. 61. Section 91.1708 of the Los Angeles Municipal Code is amended to
read as follows:
.
SEC. 91.1708. STRUCTURAL
TESTING FOR SEISMIC RESISTANCE.
Section 1708 of the eBC is adopted by reference, except Section 1708.1 of the
CBC is not adopted; and, in lieu, Subsection 91.1708.1 is added.
91.1708.1. Where Req uired. Where proposed construction is not capable of being
designed by approved engineering analysis, or where proposed construction design
method does not comply with the applicable material design standard, the system of
construction or the structural unit and the connections shall be subjected to the tests
prescribed in Section 1710. The Superintendent of Building shall accept certified
reports of such tests conducted by an approved testing agency, provided that such tests
meet the requirements of this Code and approved procedures.
Sec. 62. Subsection 91.1708.3 of the Los Angeles Municipal Code is deleted in
its entirety.
46
Sec. 63. Section 91.1709 of the Los Angeles Municipal Code is deleted in its
entirety.
Sec. 64. Section 91.1710 of the Los Angeles Municipal Code is deleted in its
entirety.
Sec. 65. Section 91.1711 of the Los Angeles Municipal Code is deleted in its
entirety.
Sec. 66. Section 91.1712 of the Los Angeles Municipal Code is amended to
read as follows:
SEC. 91.1712. CERTIFIED SECURITY BAR INSTALLER,
91,1712.1. General. A certified security bar installer may certify to the Department of
Building and Safety that any bars, grilles, grates, security rolldown shutters, or similar
devices installed on required emergency escape windows or doors meet the
requirements of Section 91.6304.3 of this Code.
The Department may allow the use of a certified installer if:
1.
The certified installer obtains a Certificate of Registration in
accordance with the provisions of this section.
2.
The certified installer files with the Department a Certificate of
Compliance for each dwelling unit for which certification is being made. The
Certificate of Compliance shall be on a form provided by the Department and
shall be signed by the property owner and the certified installer.
3.
The Certificate of Compliance processing fee is paid in accordance
with Subsection 91.107.7 of this Code.
4.
The certified installer files the Certificate of Compliance with the
Department with in 15 days after completion of the installation.
91,1712,2, Registration, A certified installer shall obtain a Certificate of Registration
from the Department of Building and Safety.
91,1712,3,
Application.
91.1712.3,1. Forms. Application for a certified security bar installer Certificate of
Registration shall be made on a form furnished by the Department.
91.1712.3.2. Information Necessary. The application shall bear the name and
address of the applicant and, if a firm, partnership or corporation, the names of the
47
principal officers. The application shall carry other information deemed necessary by
the Department.
91.1712.3.3. Verification. The applicant shall declare that the information contained in
the application is true and correct.
91.1712.3.4.
$125.00.
91.1712.4.
Fees. The application shall be accompanied by an examination fee of
Examination.
91.1712.4.1. Examination Required. Before any person shall be issued a Certificate
of Registration, the applicant, who must be an officer in the case of a firm, partnership
or corporation, shall have successfully passed the examination required for the
issuance of the certificate within ninety (90) days preceding the date of the issuance.
91.1712.4.2. Experience Requi red. To be eligible for the examination for a
Registration Certificate, the applicant shall have a valid California State Contractor's
License in an appropriate specialty and a valid City Business Tax Certificate.
91.1712.4.3. Board of Examiners. The Superintendent of Building or a Board of
Examiners composed of qualified person(s) appointed by the Superintendent shall
conduct examinations.
The results of every examination shall be subject to the approval of the
Superintendent.
Each examiner shall serve at the pleasure of the Superintendent of Building and
shall serve for a period of one year unless reappointed by the Superintendent.
91.1712.4.4. Scope of Examination. The examination shall, in the judgment of the
board, fairly determine the ability of the applicant to perform properly the work, which he
or she would be authorized to do by the certificate requested, and may include the
following:
1.
A written test.
2.
Practical tests as may be required.
3.
An oral interview as may be required.
4.
Other tests as may be required by the Board of Examiners.
91.1712.4.5. Time of Exami nation. The applicant shall be examined as soon as
practicable after filing an application.
48
91,1712.4,6. Ru les and Regulations.
The Department shall have the authority to
establish rules and regulations for the conduct of examinations.
91.1712.4,7, Fitness of Applicant. Any applicant for a certificate may be required to
submit satisfactory proof of his or her fitness to carry out the intent of this Code.
91.1712.4.8. Failure to Pass, Every applicant who fails to pass an examination shall
not be eligible for another examination until four (4) weeks after taking the previous
examination. Any applicant who fails to pass on the third try shall not be eligible again
until six (6) months after taking the previous examination.
91.1712.5.
Issuance of Certificates,
91.1712.5.1. Upon the payment of a $90 fee, the Department may issue a Certificate of
Registration to every applicant who passes the required examination for a certified
security bar installer.
91.1712,5,2, Renewal of Certificates.
Expired certificates may be renewed at any
time within twelve (12) months following the date of expiration. However, after the first
month, the renewal fee shall be increased by 10 percent for each subsequent month.
After a certificate has been expired for one year, it may not be renewed; however, an
applicant may apply for a new certificate at that time.
91,1712,6,
Exhibition
of Certificate.
91.1712,6,1, Every person having a fixed place of business shall keep his or her
Certificate of Registration posted in some conspicuous location at his or her place of
business during the time the certificate is in force.
91,1712.6.2. Every person not having a fixed place of business shall carry his or her
Certificate of Registration with him or her at all times while doing any work pursuant to
this certificate.
91.1712.7. Revocation of Certificate. Any certificate may be suspended or revoked in
accordance with the provisions of Article 8, Chapter IX of the Los Angeles Municipal
Code.
91.1712.8. Transfer of Certificate.
No certificate shall be transferable. A Certificate
of Registration issued to a firm, partnership or corporation may not be transferred. The
dissolution of a firm, partnership or corporation renders the certificate void.
49
Sec. 67. Section 91.1713 of the Los Angeles Municipal Code is added to read as
follows:
SEC. 91.1713. PREFABRICATED CONSTRUCTION.
91.1713.1.
General.
91.1713.1.1. Purpose. The purpose of this section is to regulate materials and
establish methods of safe construction where any structure or portion of the structure is
wholly or partially prefabricated.
91.1713.1.2. Scope. Unless otherwise specifically stated in this section, all
prefabricated construction and all materials used in the construction shall conform to all
the requirements of this Code. (See Subsection 91.104.2.6.)
91.1713.1.3.
Definition.
PREFABRICATED ASSEMBLY is a structural unit, the integral parts of
which have been built up or assembled prior to incorporation in the building.
91.1713.2. Tests of Materials. Every approval of a material not specifically mentioned
in this Code shall incorporate as a proviso, the kind and number of tests to be made
during prefabrication.
91.1713.3. Tests of Assemblies. The Superintendent of Building may require special
tests to be made on assemblies to determine their durability and weather resistance.
91.1713.4. Connections. See CBC Section 1611.11.1 for design requirements of
connections for prefabricated assemblies.
91.1713.5. Pipes and Conduits. See C BC Section 1611.11.2 for design requirements
for removal of material for pipes, conduits and other equipment.
91.1713.6.
Certificate and Inspection.
91.1713.6.1. Materials. Materials and the assembly of materials shall be inspected to
determine compliance with this Code. Every material shall be graded, marked or
labeled where required elsewhere in this Code.
91.1713.6.2. Certificate. A Certificate of Approval shall be furnished with every
prefabricated assembly, except where the assembly is readily accessible to inspection
at the site. The Certificate of Approval shall certify that the assembly in question has
been inspected and meets all the requirements of this Code. When mechanical
equipment is installed so that it cannot be inspected at the site, the Certificate of
Approval shall certify that the equipment complies with all applicable laws and
regulations.
50
91.1713.6.3. Certifying Agency. To be acceptable under this Code, every Certificate
of Approval shall be made by an approved agency.
91.1713.6.4. Field Erection. Placement of prefabricated assemblies at the building
site shall be inspected by the Department to determine compliance with this Code.
91.1713.6.5. Continuous Inspection. If continuous inspection is required for certain
materials where construction takes place on the site, it shall also be required where the
same materials are used in prefabricated construction.
EXCEPTION: Continuous inspection will not be required during
prefabrication if the approved agency certifies to the construction and furnishes
evidence of compliance.
Sec. 67. Section 91.1715 of the Los Angeles Municipal Code is deleted in its
entirety.
Sec. 68. Section 91.1716 of the Los Angeles Municipal Code is deleted in its
entirety.
Sec. 69. Section 91.1717 of the Los Angeles Municipal Code is deleted in its
entirety.
Sec. 70. Section 91.1718 of the Los Angeles Municipal Code is deleted in its
entirety.
Sec. 71. Section 91.1802 of the Los Angeles Municipal Code is amended to
read as follows:
SEC. 91.1802.
DEFINITIONS.
Section 1802 of the CBC is adopted by reference.
Sec. 72. Section 91.1804 of the Los Angeles Municipal Code is amended to
read as follows:
SEC. 91.1804. EXCAVATION, GRADING AND FILL.
Section 1804 of the CBC is adopted by reference.
51
Sec. 73. Section 91.1807 of the Los Angeles Municipal Code is amended to
read as follows:
SEC. 91.1807. FOUNDATION WALLS, RETAINING WALLS, AND EMBEDDED
POST AND POLES.
Section 1807 of the CBC is adopted by reference, except Sections1807.1.4 and
1807.1.6 the CBC are not adopted and t in lieu t Subsections 91.1807.1.4 and
91.1807.1.6 are added.
91.1807.1.4. Permanent Wood Foundation Systems. Permanent wood foundation
systems shall be designed and installed in accordance with AF & PA PWF and as
otherwise approved by the Department. Lumber and plywood shall be treated in
accordance with AWPA U1 (Commodity Specification At Use Category 4B and Section
5.2) and shall be identified in accordance with Section 2303.1.8.1. Permanent wood
foundation systems shall not be used for structures assigned to Seismic Design
Category D, E or F.
EXCEPTION: Accessory buildings not used for human occupancy and
less than 120 square feet (11.1 m2) in area may be supported on treated wood
mud sills.
91.1807.1.6. Prescriptive Design of Concrete and Mason ry Foundation Walls.
Concrete and masonry foundation walls that are laterally supported at the top and
bottom shall be permitted to be designed and constructed in accordance with this
Section. Prescriptive design of foundation walls shall not be used for structures
assigned to Seismic Design Category D, E or F.
Sec. 74. Section 91.1808 of the Los Angeles Municipal Code is amended to
read as follows:
SEC. 91.1808. FOUNDATIONS.
Section 1808 of the CSC is adopted by reference.
Sec. 75. Section 91.1809 of the Los Angeles Municipal Code is amended to
read as follows:
SEC. 91.1809. SHALLOW FOUNDATIONS.
Section 1809 of the CSC is adopted by reference, except Section 1809.3,
1809.4 and 1809.12 are not adopted; and, in lieu, Subsections 91.1809.3,91.1809.4,
91.1809.7 and 91.1809.12 are added.
91.1809.3. Stepped Footing. The top surface of footings shall be level. The bottom
surface of footings shall be permitted to have a slope not exceeding one unit vertical in
52
10 units horizontal (10-percent slope). Footings shall be stepped where it is necessary
to change the elevation of the top surface of the footing or where the surface of the
ground slopes more than one unit vertical in 10 units horizontal (10-percent slope). For
structures assigned to Seismic Design Category 0, E or F, the stepping requirement
shall also apply to the top surface of grade beams supporting walls. Footings shall be
reinforced with four % inch diameter (12.7 mm) deformed reinforcing bars. Two bars
shall be placed at the top and bottom of the footings as shown in Figure 1809.3 of this
Code.
REC'O"ll1!1lEND:
9,;;'
b
b.~ 2!{I~
91.1809.4. Depth and Width of Footings. The minimum depth of footings below the
surface of undisturbed soil, compacted fill material or CLSM shall be 12 inches (305
mm). Where applicable, the requirements of CBC Section 1809.5 shall also be
satisfied. The minimum width of footings shall be 12 inches (305 mm).
91.1809.7. Prescriptive Footings for Light-Frame Construction.
Where a specific
design is not provided, concrete or masonry-unit footings supporting walls of light-frame
construction shall be permitted to be designed in accordance with Table 1809.7.
Prescriptive footings in Table 1809.7 shall not exceed one story above grade plane for
structures assigned to Seismic Design Category 0, E or F.
53
TABLE 1809.7
PRESCRIPTIVE FOOTINGS SUPPORTING WALLS OF LIGHT-FRAMED
CONSTRUCTION a, b, C, d, e
WIDTH OF
FOOTING
(inches)
THICKNESS OF FOOTING
(inches)
1
12
6
2
15
6
3
18
8§
NUMBER OF FLOORS
SUPPORTED BY THE FOOTING
f
For SI: one inch
= 25.4
mm, one foot
= 304.8
mm
Depth of footings shall be in accordance with Section 1809.4.
The ground under the floor is permitted to be excavated to the elevation of the top of the
footing.
c.
Not adopted.
d.
See CSC Section 1908 for additional requirements for footings of structures assigned to
Seismic Design Category C, D, Ear F.
e.
For thickness of foundation walls, see Section 91.1807.1.6 of this Code.
f.
Footings are permitted to support a roof in addition to the stipulated number of floors.
Footings supporting roof only shall be as required for supporting one floor.
a.
b.
91.1809.12. Timber Footings. Timber footings shall be permitted for buildings of Type
V construction and as otherwise approved by the Department. Such footings shall be
treated in accordance with AWPA U1 (Commodity Specification A, Use Category 48).
Treated timbers are not required where placed entirely below permanent water level, or
where used as capping for wood piles that project above the water level over
submerged or marsh lands. The compressive stresses perpendicular to grain in
untreated timber footings supported upon treated piles shall not exceed 70 percent of
the allowable stresses for the species and grade of timber as specified in the AF&PA
NDS. Timber footings shall not be used in structures assigned to Seismic Design
Category 0, E or F.
Sec. 76. Subsection 91.1810.3.2.4 of the Los Angeles Municipal Code is
amended to read as follows:
91.1810.3.2.4. Timber. Timber deep foundation elements shall be designed as piles or
poles in accordance with AF&PA NOS. Round timber elements shall conform to ASTM
D 25. Sawn timber elements shall conform to DOC PS-20. Timber shall not be used in
structures assigned to Seismic Design Category 0, E or F.
54
Sec. 77. Subsection 91.1810.3.3.1.4 of the Los Angeles Municipal Code is
amended to read as follows:
91.1810.3.3.1.4. Allowable Frictional Resistance. The assumed frictional resistance
developed by any uncased cast-in-place deep foundation element shall not exceed onesixth (1/6) of the bearing value of the soil material at minimum depth as set forth in CSC
Table 1806.2, up to a maximum of 500 psf (24 kPa), unless a greater value is allowed
by the Department on the basis of a geotechnical investigation as specified in Section
1803 or a greater value is substantiated by a load test in accordance with CSC Section
1810.3.3.1.2. Frictional resistance and bearing resistance shall not be assumed to act
simultaneously.
Sec. 78. Subsection 91.1810.3.10.4 of the Los Angeles Municipal Code is
amended to read as follows:
91.1810.3.10.4. Seismic Reinforcement. For structures assigned to Seismic Design
Category C, a permanent steel casing shall be provided from the top of the micropile
down to the point of zero curvature. For structures assigned to Seismic Design
Category 0, E or F, the micropile shall be considered as an alternative system in
accordance with LAMC Section 91.104.2.6. The alternative system design, supporting
documentation and test data shall be submitted to the Department for review and
approval.
Sec. 79. Subsection 91.1810.4.8 of the Los Angeles Municipal Code is added to
read as follows:
91.1810.4.8. Hollow-stem Augered, Cast-in-Place Elements. An indicator pile
program shall be performed to confirm the installation procedure and to determine the
pile capacity by static load testing. Upon completion of the pile load testing, at least one
test pile shall be entirely exhumed to examine the pile integrity. Prior to the installation
of production piles, the results of the testing, and confirmation or revision to the pile
capacity shall be determined. Where concrete or grout is placed by pumping through a
hollow-stem auger, the auger shall be permitted to rotate in a clockwise direction during
withdrawal. As the auger is withdrawn at a steady rate or in increments not to exceed
1 foot (305mm), concreting or grouting pumping pressures shall be measured and
maintained high enough at all times to offset hydrostatic and lateral earth pressures.
Concrete or grout volumes shall be measured to ensure that the volume of concrete or
grout placed in each element is equal to or greater than the theoretical volume of the
hole created by the auger. Where the installation process of any element is interrupted
or a loss of concreting or grouting pressure occurs, the element shall be redrilled to
5 feet (1524 mm) below the elevation of the tip of the auger when the installation was
interrupted or concrete or grout pressure was lost and reformed. Augered cast-in-place
elements shall not be installed within six diameters center to center of an element filled
with concrete or grout less than 12 hours old, unless approved by the building official.
If the concrete or grout level in any completed element drops due to installation of an
adjacent element, the element shall be replaced.
55
Sec. 80. Division 19 of Article 1 of Chapter IX of the Los Angeles Municipal
Code is amended to read as follows:
SEC. 91.1900. BASIC PROVISIONS.
Chapter 19 of the CBC is adopted by reference, except that Sections 1908.1,
1908.1.2, 1908.1.8 and 1909.4 of the CBC are not adopted; and Subsections
91.1905.1,91.1905.1.8,91.1905.1.11,
91.1905.1.12, 91.1905.1.13 and 91.1906.1 of
this Code are added.
91.1905.1. General. The text of ACI318 shall be modified as indicated in
CBC Sections 1905.1.1 through 1905.1.13.
91.1905.1.8. AC1318, Section 22.10. Delete AC1318, Section 22.10, and replace with
the following:
22.10 - Plain concrete in structures assigned to Seismic Design Category C, 0,
E or F.
22.10.1 - Structures assigned to Seismic Design Category C, 0, E or F shall not
have elements of structural plain concrete, except as follows:
(a) Concrete used for fill with a minimum cement content of two (2) sacks
of Portland cement per cubic yard.
(b) Isolated footings of plain concrete supporting pedestals or columns
are permitted, provided the projection of the footing beyond the face of the
supported member does not exceed the footing thickness.
(c) Plain concrete footings supporting walls are permitted, provided the
footings have at least two continuous longitudinal reinforcing bars. Bars shall not
be smaller than NO.4 and shall have a total area of not less than 0.002 times the
gross cross-sectional area of the footing. A minimum of one bar shall be
provided at the top and bottom of the footing. Continuity of reinforcement shall
be provided at corners and intersections.
In detached one- and two-family dwellings three stories or less in height and
constructed with stud-bearing walls, plain concrete footings with at least two continuous
longitudinal reinforcement bars not smaller than NO.4 are permitted to have a total area
of less than .002 times the gross cross-sectional area of the footing.
91.1905.1.10. ACI 318, Section 21.6.4. Modify ACI 318, Section 21.6.4 by adding
Section 21.6.4.8 to read as:
21.6.4.8 - Where the calculated point of contraflexure is not within the
middle half of the member clear height, provide transverse reinforcement as
56
specified in ACI318 Section 21.6.4.1 items (a) through (c), over the full height of
the member.
91.1905.1.11. ACI 318~ Section 21.6.4. Modify ACI 318, Section 21.6.4, by adding
Section 21.6.4.9 to read as follows:
21.6.4. 9 - At any section where the design strength, DPn, of the column is
less than the sum of the shears Ve computed in accordance with ACI 318
Sections 21.5.4.1 and 21.6.5.1 for all the beams framing into the column above
the level under consideration, transverse reinforcement as specified in ACI 318
Sections 21.6.4.1 through 21.6.4.3 shall be provided. For beams framing into
opposite sides of the column, the moment components may be assumed to be of
opposite sign. For determination of the design strength, Pn, of the column, these
moments may be assumed to result from the deformation of the frame in anyone
principal axis.
91.1905.1.12. ACI 318~ Section 21.9.4. Modify AC1318, Section 21.9.4, by adding
Section 21.9.4.6 to read as follows:
21.9.4.6 - Walls and portions of walls with Pu > 0.35Po shall not be
considered to contribute to the calculated strength of the structure for resisting
earthquake- induced forces. Such walls shall conform to the requirements of
ACI 318 Section 21.13.
91.1905.1.13. AC1318~ Section 21.11.6. Modify AC1318, Section 21.11.6. by adding
Section 21.11.6.1 as follows:
21 .11.6.1 - Collector and boundary elements in topping slabs placed over
precast floor and roof elements shall not be less than 3 inches (76 mm) or 6 db
thick, where db is the diameter of the largest reinforcement in the topping slab.
[CBC Section 1913.3.6]
91.1906.1.
STRUCTURAL PLAIN CONCRETE.
Scope. The design and construction of structural plain concrete, both cast-inplace and precast, shall comply with the minimum requirements of ACI 318, as modified
in Section 1905.
EXCEPTION: For Group R-3 occupancies and buildings of other
occupancies less than two stories above grade plane of light-frame construction,
the requ ired footing thickness of AC I 318 is permitted to be reduced to 6 inches
(152mm), provided that the footing does not extend more than 4 inches (102
mm) on either side of the supported wall. This exception shall not apply to
structural elements designed to resist seismic lateral forces for structures
assigned to Seismic Design Category D, Ear F.
57
Sec. 81. Subsections 91.1908.1 through and including 91.1909.4 of the
Los Angeles Municipal Code are deleted in their entirety.
Sec. 82. Subsection 91.2113.3 of the Los Angeles Municipal Code is amended
to read as follows:
91.2113.3. Seismic Reinforcing.
Masonry or concrete chimneys shall be constructed,
anchored, supported and reinforced as required in this division. In structures assigned
to Seismic Design Category C or 0, masonry and concrete chimneys shall be reinforced
and anchored as detailed in CBC Sections 2113.3.1,2113.3.2 and 2113.4. In
structures assigned to Seismic Design Category A or B, reinforcement and seismic
anchorage is not required. In structures assigned to Seismic Design Category E or F,
masonry and concrete chimneys shall be reinforced in accordance with the
requirements of CBC Sections 2101 through 2108.
Notwithstanding any other provisions of this Code, an existing masonry chimney,
which is altered or repaired more than ten percent of its replacement cost within a
12-month period, shall have its entire chimney structure comply with the current
requirements of this Code or other standards approved by the Superintendent of
Building.
Sec. 83. Section 91.2200 of the Los Angeles Municipal Code is amended to
read as follows:
SEC. 91.2200. BASIC PROVISIONS.
Chapter 22 of the CBC is adopted by reference, except that Section 2204.1 of
the CBC is modified, and Subsections 91.2204.1 and 91.2205. 3 are added.
Sec. 84. Section 91.2204 of the Los Angeles Municipal Code is amended to
read as follows:
SEC. 91.2204. CONNECTIONS.
91.2204.1. Welding. The details of design, workmanship and technique for welding,
inspection of welding and qualification of welding operators shall conform to the
requirements of the specifications listed in Sections 2205,2206,2207,2208,2209,
2210 and 2211. Special inspection of welding shall be provided where required by
Section 91.1705.
All welding, except when performed at the shop of an approved fabricator, shall
be done by operators certified by the Department for the type of operation involved in
accordance with the provisions of CBC Section 1705.2.2.1.
Complete details of location, type, size and amount of all welds shall be clearly
shown on the plans. Where symbols are used on the plans, they shall be the
58
"Standard Welding Symbols," AWS A 2.4, of the American Welding Society (AWS).
When it is necessary to use a special erection sequence of welding to minimize lockedup stresses or distortion, the Department may require the erection sequence of welding
to be shown on the plans.
Welding procedures are qualified if they are in accordance with the AWS. Other
welding procedures require special qualification approval by the Department. Each
application for a special qualification shall be accompanied by a fee of $50.00.
Sec. 85. Subsection 91.2205.4 of the Los Angeles Municipal Code is
renumbered as Subsection 91.2205.3 and amended to read as follows:
91.2205.3. Modifications to AISC 341, Section F2.5, Members, Special
Concentrically
Braced Frames (SCBF) Modifications.
AISC 341, Section F2.5b. is
modified to add a new requirement as follows:
Section F2.5b(4) - The use of rectangular HSS are not permitted for
bracing members, unless filled solid with cement grout having a minimum
compressive strength of 3000 psi (20.7 MPa) at 28 days. The effects of
composite action in the filled composite brace shall be considered in the
sectional properties of the system where it results in the more severe loading
condition or detailing.
Sec. 86. Subsection 91.2306.2 of the Los Angeles Municipal Code is amended
to read as follows:
91.2306.2. Wood-Frame Diaphragms. Wood-frame diaphragms shall be designed
and constructed in accordance with AF&PA SDPWS. Where panels are fastened to
framing members with staples, requirements and limitations ofAF&PA SDPWS shall be
met and the allowable shear values set forth in CSC Table 2306.2(1) or 2306.2(2) shall
only be permitted for structures assigned to Seismic Design Category A, B, or C.
EXCEPTION: Allowable shear values where panels are fastened to
framing members with staples may be used if such values are substantiated by
cyclic testing and approved by the building official.
The allowable shear values in Tables 2306.2(1) and 2306.2(2) are permitted to
be increased 40 percent for wind design.
Wood structural panel diaphragms used to resist seismic forces in structures
assigned to Seismic Design Category D, E or F shall be applied directly to the framing
members.
EXCEPTION: Wood structural panel diaphragm is permitted to be
fastened over solid lumber planking or laminated decking, provided the panel
joints and lumber planking or laminated decking joints do not coincide.
59
Sec. 87. Subsection 91.2306.2.1 of the Los Angeles Municipal Code is deleted
in its entirety.
Sec. 88. Subsection 91.2306.3 of the Los Angeles Municipal Code is amended
to read as follows:
91.2306.3. Wood~Frame Shear Walls. Wood-frame shear walls shall be designed and
constructed in accordance with AF&PA SDPWS. For structures assigned to Seismic
Design Category D, E, or F, application of Tables 4.3A and 4.38 of AF&PA SDPWS
shall include the following:
1.
Wood structural panel thickness for shear walls shall not be less
than 3/8-inch thick and studs shall not be spaced at more than 16 inches on
center.
2.
The maximum nominal unit shear capacities for three-ply plywood
resisting seismic forces in structures assigned to Seismic Design Category 0, E
or F is 400 pounds per linear foot (pit).
3.
Where shear design values using allow stress design (ASO)
exceed 350 plf or load and resistance factor design (LRFD) exceed 500 plf, all
framing members receiving edge nailing from abutting panels shall not be less
than a single 3-inch nominal member, or two 2-inch nominal members fastened
together in accordance with Section 2306.1 to transfer the design shear value
between framing members. Wood structural panel joint and sill plate nailing shall
be staggered at all panel edges. See Section 4.3.6.1 and 4.3.6.4.3 of AF&PA
SDPWS for sill plate size and anchorage requirements.
4.
Nails shall be placed not less than 1/2 inch in from the panel edges
and not less than 3/8 inch from the edge of the connecting members for shear
greater than 350 plf using ASD or 500 plf using LRFO. Nails shall be placed not
less than 3/8 inch from panel edges and not less than 1/4 inch from the edge of
the connecting members for shears of 350 plf or less using ASO or 500 plf or less
using LRFD.
5.
Table 4.38 application is not allowed for structures assigned to
Seismic Design Category D, Ear F.
For structures assigned to Seismic Design Category D, application of Table 4.3C
of AF&PA SDPWS shall not be used below the top level in a multi-level building for
structures.
Where panels are fastened to framing members with staples, requirements and
limitations of AF&PA SDPWS shall be met and the allowable shear values set forth in
Table 2306.3(1),2306.3(2) or 2306.3(3) shall only be permitted for structures assigned
to Seismic Design Category A, 8, or C.
60
EXCEPTION: Allowable shear values where panels are fastened to
framing members with staples may be used if such values are substantiated by
cyclic testing and approved by the building official.
The allowable shear values in Tables 2306.3(1) and 2306.3(2) are permitted to
be increased 40 percent for wind design. Panels complying with ANSI/APA PRP-21 0
shall be permitted to use design values for Plywood Siding in the AF&PA SDPWS.
Sec. 89. Subsection 91.2306.7 of the Los Angeles Municipal Code is
renumbered as Subsection 91.2306.4 and amended to read as follows:
91.2306.4. Shear Walls Sheathed with Other Materials. Shear walls sheathed with
Portland cement plaster, gypsum lath, gypsum sheathing or gypsum board shall be
designed and constructed in accordance with AF&PA SDPWA. Shear walls sheathed
with these materials are permitted to resist horizontal forces using the allowable shear
capacities set forth in CBC Table 2306.3(3). Shear walls sheathed with Portland
cement plaster, gypsum lath, gypsum sheathing or gypsum board shall not be used to
resist seismic forces in structures assigned to Seismic Design Category E or F.
Shear walls sheathed with lath, plaster or gypsum board shall not be used below
the top level in a multi-level building for structures assigned to Seismic Design Category
D.
Sec. 90. Section 91.2308 of the Los Angeles Municipal Code is amended to
read as follows:
SEC. 91.2308. CONVENTIONAL
LIGHT-FRAME CONSTRUCTION.
Section 2308 of the CBC is adopted by reference, except that Sections 2308.3.4,
2308.9.3.1,2308.12.1,
2308.12.2, 2308.12.4 and 2308.5 of the CBC are not adopted
and, in lieu, Subsections 91.2308.3.4, 91.2309.3.1, 91.2308.9.3.2, 91.2308.12.1,
91.2308.12.2,91.2308.12.4,91.2308.12.5,
and Table 2308.4 are added.
Sec. 91. A new Subsection 91.2308.9.3.1 is added to the Los Angeles Municipal
Code to read as follows:
91.2308.9.3.1. Alternative Bracing. Any bracing required by Section 2308.9.3 is
permitted to be replaced by the following:
1.
In one-story buildings, each panel shall have a length of not less
than 2 feet 8 inches (813 mm) and a height of not more than 10 feet (3048 mm).
Each panel shall be sheathed on one face with 15/32-inch-minimum-thickness
(9.5 mm) wood structural panel sheathing nailed with 8d common or galvanized
box nails in accordance with Table 2304.9.1 and blocked at wood structural
panel edges. Two anchor bolts installed in accordance with Section 2308.6 shall
be provided in each panel. Anchor bolts shall be placed at each panel outside
quarter points. Each panel end stud shall have a tie-down device fastened to the
61
foundation, capable of providing an approved uplift capacity of not less than
1,800 pounds (8006 N). The tie-down device shall be installed in accordance
with the manufacturer's recommendations. The panels shall be supported
directly on a foundation or on floor framing supported directly on a foundation
that is continuous across the entire length of the braced wall line. This
foundation shall be reinforced with not less than one NO.4 bar top and bottom.
Where the continuous foundation is required to have a depth greater than
12 inches (305 mm), a minimum 12-inch by 12-inch (305 mm by 305 mm)
continuous footing or turned down slab edge is permitted at door openings in the
braced wall line. This continuous footing or turned down slab edge shall be
reinforced with not less than one NO.4 bar top and bottom. This reinforcement
shall be lapped 15 inches (381 mm) with the reinforcement required in the
continuous foundation located directly under the braced wall line.
2.
In the first story of two-story buildings, each wall panel shall be
braced in accordance with Section 2308.9.3.1, Item 1, except that the wood
structural panel sheathing shall be provided on both faces, three anchor bolts
shall be placed at one-quarter points, and tie-down device uplift capacity shall not
be less than 3,000 pounds (13 344 N).
Sec. 92. A new Subsection 91.2308.9.3.2 is added to the Los Angeles Municipal
Code to read as follows:
91.2308.9.3.2. Alternate Bracing Wall Panel Adjacent To A Door Or Window
Opening. Any bracing required by Section 2308.9.3 is permitted to be replaced by the
following when used adjacent to a door or window opening with a full-length header:
1.
In one-story buildings, each panel shall have a length of not less
than 16 inches (406 mm) and a height of not more than 10 feet (3048 mm).
Each panel shall be sheathed on one face with a single layer of 15/32 inch
(9.5 mm) minimum thickness wood structural panel sheathing nailed with
8d common or galvanized box nails in accordance with Figure 2308.9.3.2.
The wood structural panel sheathing shall extend up over the solid sawn or
glued-laminated header and shall be nailed in accordance with Figure
2308.9.3.2. A built-up header consisting of at least two 2 x 12s and fastened in
accordance with Item 24 of Table 2304.9.1 shall be permitted to be used.
A spacer, if used, shall be placed on the side of the built-up beam opposite the
wood structural panel sheathing. The header shall extend between the inside
faces of the first full-length outer studs of each panel. The clear span of the
header between the inner studs of each panel shall be not less than 6 feet
(1829 mm) and not more than 18 feet (5486 mm) in length. A strap with an uplift
capacity of not less than 1,000 pounds (4,400 N) shall fasten the header to the
inner studs opposite the sheathing. One anchor bolt not less than 5/8 inch
(15.9 mm) diameter and installed in accordance with Section 2308.6 shall be
provided in the center of each sill plate. The studs at each end of the panel shall
62
have a tie-down device fastened to the foundation with an uplift capacity of not
less than 4,200 pounds (18480 N).
Where a panel is located on one side of the opening, the header shall
extend between the inside face of the first full-length stud of the panel and the
bearing studs at the other end of the opening. A strap with an uplift capacity of
not less than 1,000 pounds (4400 N) shall fasten the header to the bearing studs.
The bearing studs shall also have a tie-down device fastened to the foundation
with an uplift capacity of not less than 1,000 pounds (4400 N).
The tie-down devices shall be an embedded strap type, installed in
accordance with the manufacturer's recommendations. The panels shall be
supported directly on a foundation that is continuous across the entire length of
the braced wall line. This foundation shall be reinforced with not less than one
NO.4 bar top and bottom.
Where the continuous foundation is required to have a depth greater than
12 inches (305 mm), a minimum 12-inch by 12-inch (305 mm by 305 mm)
continuous footing or turned down slab edge is permitted at door openings in the
braced wall line. This continuous footing or turned down slab edge shall be
reinforced with not less than one NO.4 bar top and bottom. This reinforcement
shall be lapped not less than 15 inches (381 mm) with the reinforcement required
in the continuous foundation located directly under the braced wall line.
2.
In the first story of two-story buildings, each wall panel shall be
braced in accordance with Item 1 above, except that each panel shall have a
length of not less than 24 inches (610 mm).
Sec. 93. Subsection 91.2308.12.1 of the Los Angeles Municipal Code is deleted
in its entirety.
Sec. 94. The first unnumbered paragraph of Subsection 91.2308.12.4 of the
Los Angeles Municipal Code is amended to read as follows:
91.2308.12.4. Braced Wall Line Sheathing. Braced wall lines shall be braced by one
of the types of sheathing prescribed by Table 2308.12.4 as shown in Figure 2308.9.3.
The sum of lengths of braced wall panels at each braced wall line shall conform to the
required percentage of wall length required to be braced per braced wall line in Table
2308.12.4. Braced wall panels shall be distributed along the length of the braced wall
line and start at not more than 8 feet (2438 mm) from each end of the braced wall line.
Panel sheathing joints shall occur over studs or blocking. Sheathing shall be fastened
to studs, top and bottom plates and at panel edges occurring over blocking. Wall
framing to which sheathing used for bracing is applied shall be nominal 2-inch-wide
[actual 1 1/2 inch (38 mm)] or larger members. Braced wall panel construction types
shall not be mixed within a braced wall line. Braced wall panels required by
63
CBC Section 2308.12.4 may be eliminated when all of the following requirements are
met:
Sec. 95. Two unnumbered paragraphs are added at the end of
Subsection 91.2308.12.4 of the Los Angeles Municipal Code to read as follows:
Wood structural panel sheathing shall be minimum of 15/32 inch thick nailed with
a 8d common placed 318 inches from panel edges and spaced not more than 6 inches
on center and 12 inches on center along intermediate framing members.
Cripple walls having a stud height exceeding 14 inches (356 mm) shall be
considered a story for the purpose of this section and shall be braced as required for
braced wall lines in accordance with the required percentage of wall length required to
be braced per braced wall line in Table 2308.12.4. Where interior braced wall lines
occur without a continuous foundation below, the length of parallel exterior cripple wall
bracing shall be one and one-half times the lengths req uired by Table 2308.12.4.
Where the cripple wall sheathing type used is Type S-W and this additional length of
bracing cannot be provided, the capacity of Type S-W sheathing shall be increased by
reducing the spacing of fasteners along the perimeter of each piece of sheathing to 4
inches (102 mm) o.c.
Sec. 96. Table 2308.12.4 of the Los Angeles Municipal Code is amended to read
as follows:
TABLE 2308.12.4
WALL BRACING IN SEISMIC DESIGN CATEGORIES D AND E
(Minimum Percentage of Wall Bracing per each Braced Wall Linea)
CONDITION
One story
SHEATHING
TYPEb
G_pc
S-W
S05<0.50
0.5~S05<0.75 0.75~S05~1.00
43
21
59
32
75
37
505>1.00
100
48
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm.
a.
b.
Minimum length of panel bracing of one face of the wall for S-W sheathing shall be at least 4' -0" long
or both faces of the wall for G-P sheathing shall be at least 8'-0" long; h/w ratio shall not exceed 2:1.
For SW panel bracing of the same material on two faces of the wall, the minimum length is permitted
to be one-half the tabulated value but the h/w ratio shall not exceed 2:1 and design for uplift is
required. The 2:1 h/w ratio limitation does not apply to alternate braced wall panels constructed in
accordance with Section 2308.9.3.1 or 2308.9.3.2. Wall framing to which sheathing used for bracing
is applied shall be nominal 2 inch wide {actual 1 1/2 inch (38 mm)] or larger members and spaced a
maximum of 16 inches on center. Braced wall panel construction types shall not be mixed within a
braced wall line.
G-P
gypsum board, Portland cement plaster or gypsum sheathing boards; S-W = wood structural
panels.
=
64
c.
d.
Nailing as specified below shall occur at all panel edges at studs, at top and bottom plates and, where
occurring, at blocking:
For 1/2-inch gypsum board, 5d (0.113 inch diameter) cooler nails at 7 inches on center;
For 5/8-inch gypsum board, No. 11 gage (0.120 inch diameter) at 7 inches on center;
For gypsum sheathing board, 13/4 inches long by 7/16-inch head, diamond point galvanized nails at 4
inches on center;
For gypsum lath, No. 13 gage (0.092 inch) by 11/8 inches long, 19/64-inch head, plasterboard at 5
inches on center;
For Portland cement plaster, No. 11 gage (0.120 inch) by 1 1/2 inches long, 7/16-inch head at 6
inches on center;
S-W sheathing shall be a minimum of 15/32" thick nailed with 8d common placed 318 inches from
panel edges and spaced not more than 6 inches on center and 12 inches on center along
intermediate framing members.
Sec. 97. Division 26 of Article 1, Chapter IX of the Los Angeles Municipal Code
is amended by deleting the following footnote in its entirety.
*
The following sections of Division 26 are deleted in entirety by
Ord. No. 172,592:
91.2602; 91.2603; 91.2604
Sec. 98. Division 28 of Article 1, Chapter IX of the Los Angeles Municipal Code
is amended by deleting the following footnote in its entirety.
*
The following sections of Division 28 are deleted in entirety by
Ord. No. 172,592:
91.2801; 91.2802
Sec. 99. Division 29 of Article 1, Chapter IX of the Los Angeles Municipal Code
is amended by deleting the following footnote in its entirety.
The following sections of Division 29 are deleted in entirety by Ord.
No. 172,592:
*
91.2901; 91.2902
Sec. 100. Section 91.3001 of the Los Angeles Municipal Code is amended to
read as follows:
SEC. 91.3001. GENERAL.
Section 3001 of the CSC is adopted by reference, except that Sections 3001.1,
3001.2, 3001.4 and 3001.5 of the CSC are not adopted; and, in lieu,
Subsections 91.3001.1, 91.3001.2, 91.3001.4 and 91.3001.5 are added.
65
Sec. 101. Subsections 91.3001 .2 of the Los Angeles Municipal Code is
amended to read as follows:
91.3001.2. Referenced Standards. Except as otherwise provided for in this Code, the
design, construction, installation, alteration, repair and maintenance of elevators and
conveying systems and their components shall conform to California Code of
Regulations, Title B, Division 1, Chapter 4, Subchapter 6, Elevator Safety Orders, ASME
A90.1, ASME B20.1, ALI ALCTV, and ASCE 24 for construction in flood hazard areas
established in Section 1612.3.
Sec. 102. Subsection 91.3001.4 of the Los Angeles Municipal Code is amended
to read as follows:
91.3001.4. Change in Use. A change in use of an elevator from freight to passenger,
passenger to freight, or from one freight class to another freight class shall comply with
California Code of Regulations, Title B, Division 1, Chapter 4, Subchapter 6, Elevator
Safety Orders.
Sec. 103. Subsection 91.3001.5 of the Los Angeles Municipal Code is added to
read as follows:
91.3001.5.
Section 3001 .5 of the CBC is adopted by reference.
Sec. 104. Section 91. 3002 of the Los Angeles Municipal Code is amended to
read as follows:
SEC. 91.3002.
HOISTWAY ENCLOSURES.
Section 3002 of the CBC is adopted by reference, except that Sections 3002.1.1,
3002.3, 3002.5, 3002.6, 3002.B, 3003.2, 3005.4, 3007.1, 3007.2, 3007.9.1, 300B.2,
300B.2.1, 300B.7.6, 300B.B.1, and 300B.9.1 of the CBC are not adopted; and, in lieu,
Subsections 91.3002.1.1,91.3002.3,
91.3002.B, 91.3003.2, 91.3007.1, 91.3007.2,
91.3007.9.1, 91.300B.2, 91.300B.2.1, 91.300B.7.6, 91.300B.8.1, and 91.300B.9.1 are
added.
Sec. 105. Subsection 91.3002.1.1 of the Los Angeles Municipal Code is
amended to read as follows:
91.3002.1.1. Opening Protectives.
protected as required in Chapter 7.
Openings in hoistway enclosures shall be
Sec. 106. Subsection 91.3002.3 of the Los Angeles Municipal Code is amended
to read as follows:
91.3002.3. Emergency Signs. An approved pictorial sign of a standardized design
shall be posted adjacent to each elevator call station on all floors instructing occupants
66
to use the exit stairways and not to use the elevators in case of fire. The sign shall
read: IN CASE OF FIRE, ELEVATORS ARE OUT OF SERVICE. USE EXIT STAIRS.
EXCEPTION: The emergency sign shall not be required for elevators that
are used for occupant self-evacuation in accordance with Section 3008.
Sec. 107. A new Subsection 91.3002.8 is added to the Los Angeles Municipal
Code to read as follows:
91.3002.8. Glass in Elevator Enclosures.
with the Elevator Code.
Glass in elevator enclosures shall comply
Sec. 108. A new Subsection 91.3003.2 is added to the Los Angeles Municipal
Code to read as follows:
91.3003.2. Fire-Fighter's Emergency Operation. Elevators shall be provided with
Phase I emergency recall operation and Phase II emergency in-car operation in
accordance with the Elevator Code.
Sec. 109. A new Section 91.3007 is added to the Los Angeles Municipal Code to
read as follows:
SEC. 91.3007.
FIRE SERVICE ACCESS ELEVATOR.
91.3007.1. General. Where required by Section 403.6.1, every floor of the building
shall be served by fire service access elevators complying with Sections 3007.1 through
3007.10. Except as modified in this section, fire service access elevators shall be
installed in accordance with this Chapter and the Elevator Code.
91.3007.2. Phase I Emergency Recall Operation. Actuation of any building fire
alarm-initiating device shall initiate Phase I emergency recall operation on all fire service
access elevators in accordance with the requirements in the Elevator Code. All other
elevators shall remain in normal service unless Phase I emergency recall operation is
manually initiated by a separate, required three-position, key-operated "Fire Recall"
switch or automatically initiated by the associated elevator lobby, hoistway or elevator
machine room smoke detectors. In addition, if the building also contains occupant
evacuation elevators in accordance with Section 3008, an independent, three-position,
key-operated "Fire Recall" switch conforming to the applicable requirements in the
Elevator Code shall be provided at the designated level for each fire service.
91.3007.9.1. Protection of Wiring or Cables. Wires or cables that are located outside
of the elevator hoistway and machine room and that provide normal or standby power,
control signals, communication with the car, lighting, heating, air conditioning, ventilation
and fire-detecting systems to fire service access elevators shalt be protected by
construction having a fire-resistance rating of not less than 2 hours, or shall be circuit
integrity cable having a fire-resistance rating of not less than 2 hours.
67
Sec. 110. A new Section 91.3008 is added to the Los Angeles Municipal Code to
read as follows:
SEC. 91.3008. OCCUPANT EVACUATION
ELEVATORS.
91.3008.2. Phase I Emergency Recall Operation. An independent, three-position,
key-operated "Fire Recall" switch complying with the Elevator Code shall be provided at
the designated level for each occupant evacuation elevator.
91.3008.2.1. Operation. The occupant evacuation elevators shall be used for
occupant self-evacuation only in the normal elevator operating mode prior to Phase I
Emergency Recall Operation in accordance with the requirements in the Elevator Code
and the building's fire safety and evacuation plan.
91.3008.7.6. Lobby Status Indicator. Each occupant evacuation elevator lobby shall
be equipped with a status indicator arranged to display all of the following information:
1.
An illuminated green light and the message, "Elevators available for
occupant evacuation," when the elevators are operating in normal service and
the fire alarm system is indicating an alarm in the building.
2.
An illuminated red light and the message, "Elevators out of service,
use exit stairs," when the elevators are in Phase I emergency recall operation in
accordance with the requirements in the Elevator Code.
3.
No illuminated light or message when the elevators are operating in
normal service.
91.3008.8.1. Elevator Recall. The fire command center or an alternate location
approved by the fire department shall be provided with the means to manually initiate a
Phase I Emergency Recall of the occupant evacuation elevators in accordance with the
Elevator Code.
91.3008.9.1. Protection of Wiring or Cables. Wires or cables that are located outside
of the elevator hoistway and machine room and that provide normal or standby power,
control signals, communication with the car, lighting, heating, air conditioning, ventllation
and fire-detecting systems to fire service access elevators shall be protected by
construction having a fire-resistance rating of not less than 2 hours, or shall be circuit
integrity cable having a fire-resistance rating of not less than 2 hours.
Sec. 111. Section 91.3111 of the Los Angeles Municipal Code is renumbered as
Section 91.3112.
68
Sec.112. Subsection 91.3401.1 of the Los Angeles Municipal Code is amended
to read as follows:
91.3401.1. Scope. The provisions of this Chapter shall control the alteration, repair,
addition and change of occupancy of existing buildings and structures. In addition to
the requirements of Chapter 34 of the CBC, existing buildings and structures shall
comply with the applicable regulations of Divisions 81, 82, 83, 84, 85, 86, 88, 89, 91,
and CBC Appendix A 1 and A2 of this Code and the voluntary earthquake hazard
reduction standards of Divisions 92, 93,94,95 and 96 of this Code.
[DSA-AC] For applications listed in Section 1.9.1 regulated by the Division of the
State Architect-access Compliance for accessibility requirements, See Chapter 11B,
Section 11 B-202.
EXCEPTION: Existing bleachers, grandstands and folding and telescopic
seating shall comply with ICC 300.
[HCD I] In addition to the requirements in this chapter,
maintenance, alteration, repair, addition, or change of occupancy to
existing buildings and accessory structures under the authority of the
Department of Housing and Community Development, as provided in
Section 1.8.2.1.1, shall comply with California Code of Regulations, Title
25, Division 1, Chapter 1, Subchapter 1.
EXCEPTIONS:
1.
Alterations, repair or addition to existing bleachers,
grandstands and folding and telescopic seating shall comply with ICC 300.
2.
(HCD 2) For moved buildings and maintenance, alteration,
repair, addition, or change of occupancy to existing buildings and
accessory structures in mobilehome parks or special occupancy parks as
provided in Section 1.8.2.1.3., see California Code of Regulations,
Title 25, Division 1, Chapters 2 and 2.2.
3.
(HCD 1) Limited-density owner-built rural dwellings.
Sec. 113. Subsection 91.3401.3 of the Los Angeles Municipal Code is amended
to read as follows:
91.3401.3. Compliance.
Alterations, repairs, additions and changes of occupancy to
or relocation of existing structures shall comply with the provisions for alterations,
repairs, additions and changes of occupancy in the Los Angeles Fire Code,
Los Angeles Mechanical Code, Los Angeles Plumbing Code, Los Angeles Residential
Code and Los Angeles Electrical Code.
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Where there are different requirements in this Code, the most restrictive
requirement shall govern. Where there is a conflict between a general requirement and
a specific requirement, the specific requirement shall be applicable.
Sec. 114. Subsection 91.3403.1.1 of the Los Angeles Municipal Code is
renumbered as Subsection 91.3401.4.4 and amended to read as follows:
91.3401.4.4. Replacement, Retention and Extension of Original Materials. The
replacement, retention and extension of original materials, and the use of original
methods of construction, for any building or accessory structure may remain, provided
the aggregate value of work in anyone year does not exceed 10 percent of the
replacement value, and provided further that no hazardous conditions and such building
or structure complied with the building code provisions in effect at the time of original
construction and the building or accessory structure does not become or continue to be
a substandard building.
EXCEPTION: Replacement, retention and extension of unreinforced
masonry walls is not permitted.
Alterations, repairs or rehabilitation of the existing portion in excess of 10 percent
of the replacement value of building or structure may be made provided all the work
conforms to this Code for a new building and that no hazardous conditions or
substandard buildings are continued or created in the remainder of the building as a
result of such work.
Sec. 115. A new Subsection 91.3403.4 is added to the Los Angeles Municipal
Code to read as follows:
91.3403.4. Existing Structural Elements Carrying Lateral Load. Where the addition
is structurally independent of the existing structure, existing lateral load-carrying
structural elements shall be permitted to remain unaltered. Where the addition is not
structurally independent of the existing structure, the existing structure and its addition
acting together as a single structure shall be shown to meet the requirements of
Sections 1609 and 1613.
EXCEPTION:
All, except Unreinforced Masonry Buildings (URM):
Any existing lateral load-carrying structural element whose
demand-capacity ratio with the addition considered is no more than 10
percent greater than its demand-capacity ratio with the addition ignored
shall be permitted to remain unaltered. For purposes of calculating
demand-capacity ratios, the demand shall consider applicable load
combinations with design lateral loads or forces in accordance with
Sections 1609 and 1613. For purposes of this exception, comparisons of
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demand-capacity ratios and calculation of design lateral loads, forces and
capacities shall account for the cumulative effects of additions and
alterations since original construction.
Unreinforced Masonry (URM) Buildings:
Any existing lateral load-carrying structural element on an
unreinforced masonry building whose demand-capacity ratio with the
addition considered is less than 10 percent greater than its demandcapacity ratio without the addition, must comply with Appendix Chapter
A 1. When the demand-capacity ration with the addition considered is 10
percent or greater than its demand-capacity ratio with the addition ignored,
shall be designed per Division 16.
Sec. 116. Subsection 91.3404.1.1 of the Los Angeles Municipal Code is deleted
in its entirety.
Sec. 117. A new Subsection 91.3404.4 is added to the Los Angeles Municipal
Code to read as follows:
91.3404.4. Existing Structural Elements Carrying Lateral Load. Except as
permitted by Section 3404.5, where the alteration increases design lateral loads in
accordance with Section 1609 or 1613, or where the alteration results in a structural
irregularity as defined in ASCE 7, or where the alteration decreases the capacity of any
existing lateral load-carrying structural element, the structure of the altered building or
structure shall be shown to meet the requirements of Sections 1609 and 1613.
EXCEPTION:
All, except Unreinforced Masonry Building (URM):
Any existing lateral load-carrying structural element whose
demand-capacity ratio with the addition considered is no more than 10
percent greater than its demand-capacity ratio with the addition ignored
shall be permitted to remain unaltered. For purposes of calculating
demand-capacity ratios, the demand shall consider applicable load
combinations with design lateral loads or forces in accordance with
Sections 1609 and 1613. For purposes of this exception, comparisons of
demand-capacity ratios and calculation of design lateral loads, forces and
capacities shall account for the cumulative effects of additions and
alterations since original construction.
Unreinforced Masonry (URM) Buildings:
Any existing lateral load-carrying structural element on an
unreinforced masonry building whose demand-capacity ratio with the
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alteration considered is less than 10 percent greater than its demandcapacity ratio with the addition, must comply with Appendix Chapter A 1.
When the demand-capacity ratio with the addition considered is 10
percent or greater than its demand-capacity ratio with the addition ignored,
shall be designed per Division 16.
Structural analysis per Appendix Chapter A 1 is required for any
alterations to crosswalls or diaphragms.
Sec. 118. Subsection 91.3405.1 of the Los Angeles Municipal Code is amended
to read as follows:
91.3405.1. General. Buildings and structures, and parts thereof, shall be repaired in
compliance with Section 3401.2 and 3405. Work on nondamaged components that is
necessary for the required repair of damaged components shall be considered part of
the repair and shall not be subject to the requirements for alterations in this chapter.
Routine maintenance required by Section 3401.2, Division 81, AppendixA1 and A2 and
ordinary repairs exempt from a permit in accordance with Section 106, and abatement
of wear due to normal service conditions shall not be subject to the requirements for
repairs in this Section.
EXCEPTION: For state-owned buildings, including those owned by
the University of California and the California State University and the
Judicial Council, the requirements of CSC Sections 3405.2 through 3405.4
are replaced by the requirements of CSC Sections 3417 through 3423.
Sec. 119. Subsection 91.3405.1.2 of the Los Angeles Municipal Code is deleted
in its entirety.
Sec. 120. A new Subsection 91.3408.4 is added to the Los Angeles Municipal
Code to read as follows:
91.3408.4. Seismic. Except for unreinforced masonry building, when a change of
occupancy results in a structure being reclassified to a higher risk category, the
structure shall conform to the seismic requirements for a new structure of the higher risk
category.
EXCEPTIONS:
1.
Specific seismic detailing requirements of Section 1613 for a
new structure shall not be required to be met where the seismic
performance is shown to be equivalent to that of a new structure. A
demonstration of equivalence shall consider the regularity, overstrength,
redundancy and ductility of the structure.
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2.
When a change of use results in a structure being
reclassified from Risk Category I or II to Risk Category III and the structure
is located where the seismic coefficient, SDS, is less than 0.33,
compliance with the seismic requirements of Section 1613 are not
required.
3.
For change of occupancy of an existing commercial or
industrial building to residential use, all existing buildings shall be
analyzed for 75 percent of the design earthquake ground motion, as
defined in Section 1613.5 of this Code, but in no event shall there be a
reduction in the capacity of the seismic force resisting system where that
system provides a greater level of protection than the minimum
requirements established by this Code.
For an existing
is required, if the Risk
analysis per Appendix
table 88-A is changed
unreinforced masonry building, structural analysis per Division 16
Category is changed to III or IV per CBC table 1604.5. Structural
Chapter A 1 is required, if Rating Classification per Division 88,
to I or II.
For unreinforced masonry buildings with an approved occupant load greater than
100, the occupant load may be increased by a maximum of 10 percent without changing
the Rating Class or Risk Category.
The most restrictive requirement of Section 3403, 3404 or 3408 shall apply.
Sec. 121. Section 91 .6109 of the Los Angeles Municipal Code is amended to
read as follows:
SEC. 91.6109. SWIMMING POOLS AND OTHER BODIES OF WATER PROTECTIVE DEVICES REQUIRED.
(a)
Fences. Every swimming pool, fish pond or other body of water, which
contains water 18 inches or more in depth, shall be enclosed by a fence, the height of
which, including gates, shall be not less than four and one-half feet above the ground.
Gates shall be self-latching with the latch located four and one-half feet minimum above
the ground. However, for new swimming pools or spas, the height and construction of
the fence and gate shall comply with the requirements of Division 31, whichever is more
restrictive and provide greater safety.
Where the ground surface on the side of the fence away from the body of water
slopes upward, four and one-half feet clearance shall be maintained between the fence
and the face of the slope.
EXCEPTION: The provisions of this section shall not apply to oceans,
lakes, rivers, streams and similar bodies of water, which are publicly owned
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over which the State of California, the City, or County of Los Angeles has
control and jurisdiction.
(b)
Existing Body of Water. The provisions of this section shall also apply to
all existing bodies of water.
Sec. 122. Section 91.6202 of the Los Angeles Municipal Code is amended by
the addition of the definition of Code, in alphabetical order, to read as follows:
CODE. As used in Division 62 of Article 1, Chapter IX of the LAMC, Code
shall mean the Los Angeles Building Code and Article 4.4, Chapter I of the
LAMC. This is a clarification of and not a change to existing law.
Sec. 123. The third unnumbered Paragraph of Subsection 91.6302.3 of the
Los Angeles Municipal Code is amended to read as follows:
Ducts penetrating a ceiling or floor shall be enclosed in a shaft enclosure
conforming to the requirements of CSC Section 708. Where a shaft enclosure is not
required by CBC Section 708, ducts that convey grease vapors shall be enclosed in a
one-hour fire-resistive shaft. The shaft shall be separated from the duct by a minimum
6-inch air space vented to the outside air.
Sec. 124. Paragraph 3 of Subsection 91.6302.4 of the Los Angeles Municipal
Code is amended to read as follows:
3.
Privacy. Toilet rooms shall be so arranged or equipped with view
screens as to protect users of toilets and urinals from view from outside the room
when the door to the toilet room is open.
EXCEPTION: View screen is not required if the toilet room is only
for single accommodation, unisex and a bathroom is provided.
Entrances to the toilet rooms for different sexes shall be properly separated by a
space of at least 10 feet or by view screens.
Sec. 125. The Exception in Subsection 91.6302.5 of the Los Angeles Municipal
Code is deleted in its entirety.
Sec. 126. Subsection 91.6304.3 of the Los Angeles Municipal Code is amended
to read as follows:
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91.6304.3. Additional Requirements for Installation of Bars, Grills, Grates or
Similar Devices. In addition to the requirements of Section 1029, all bars, grills, grates
or similar devices shall comply with the following:
1. A permit is obtained from the Department of Building and Safety and a
fee is paid as required in Subsection 91.107.4.5 of this Code. Any permit so
issued shall be valid for a period of 90 days from its issuance. The Department
may allow a "certified installer" to be used, in lieu of obtaining a permit, in
accordance with Section 91.1704.
2. Any person who willfully or knowingly, with the intent to deceive, makes
a false statement or representation, or knowingly fails to disclose a material fact
in any documentation required by the Department to ascertain facts relative to
this Section, Subsection 91.107.4.5 orto Section 91.1704 of this Code, including
any oral or written evidence presented, shall be guilty of a misdemeanor.
Sec. 127. Subsection 91.7005.2 of the Los Angeles Municipal Code is amended
to read as follows:
91.7005.2. Building Foundations. Building foundations and temporary shoring shall
be designed and constructed as specified in Division 4 of the Residential Code or in
Division 18 and Division 33 of this Code.
Sec. 128. A new Subsection 91.7006.7.4 of the Los Angeles Municipal Code is
added to read as follows:
91.7006.7.4. Baseline Hillside Ordinance Conditions. All conditions of import and
export imposed in the approval of the project with respect to the Baseline Hillside
Ordinance shall be made a part of the grading permit.
Sec. 129. Subsection 91.7006.7.4 of the Los Angeles Municipal Code
renumbered as Subsection 91.7006.7.5.
Sec. 130. The Title of Figure B of Subsection 91.7015.7 of the Los Angeles
Municipal Code is amended to read as follows:
DIVERTER TERRACE
For top of cut and/or fill slopes
Sec. 131. Section 91.7200 of the Los Angeles Municipal Code is amended to
read as follows:
SEC. 91.7200. PURPOSE.
These Fire District Regulations were formerly found in Division 61.
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Sec. 132. Section 91.7208 of the Los Angeles Municipal Code is amended to
read as follows:
SEC. 91.7208. PROHIBITED VEHICLES.
No vehicle in Fire District No. 1 shall be used except as permitted for a
mobilehome, travel trailer or camp car in a park designed for that use or for an industrial
catering truck as defined in Section 91.202 of this Code. However, no person shall park
an industrial catering truck continuously at any location on private property for the
purpose of dispensing food or drink for a period of time exceeding one hour, and
regardless of the length of time parked at any location, no person after departure from
that location shall again park an industrial catering truck at that location, or at any
location on private property within 500 feet of that location or private property, for the
purpose of dispensing food or drink within a period of four hours after departure.
Sec. 133. A new Subsection 91.8101.2 is added to the Los Angeles Municipal
Code to read as follows:
91.8101.2. Scope. The provisions of th is chapter shall apply to all or portions of
existing buildings, structures or premises.
EXCEPTIONS:
1.
Historical buildings may comply with Section 8119 of this Code.
2.
Existing commercial or industrial buildings, for which a building
permit was issued prior to April 1, 1994, may be converted to "joint living and
work quarters" provided the existing building complies with Chapter 85 of this
Code and any other applicable section of the Los Angeles Municipal Code.
Sec. 134. Section 91.8107 of the Los Angeles Municipal Code is deleted in its
entirety.
Sec. 135. Section 91.8110 of the Los Angeles Municipal Code is amended to
read as follows:
SEC. 91.8110. UNREINFORCED
MASONRY BEARING WALL BUILDINGS.
Existing unreinforced masonry bearing wall buildings constructed or under
construction prior to October 6, 1933, shall conform to the requirements of Division 88
of this Code. For other than full compliance to Division 88, all alterations, repairs,
additions, Change of Occupancy, change in Class Rating per table 88A, change in
Occupancy Category, and increase in occupant load shall comply with the requirements
of Division 34.
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Sec. 136. Section 91.8201 of the Los Angeles Municipal Code is amended to
read as follows:
SEC. 91.8201. GENERAL.
Every change of occupancy, use and rating classification in any existing building
or structure shall conform to the construction requirements for the group occupancy to
be housed in the building or structure or for the use to which the building or structure is
to be put, as set forth in CBC Chapter 34, Division 34 and 82.
Sec. 137. Section 91.8202 of the Los Angeles Municipal Code is amended to
read as follows:
SEC. 91.8202. CHANGE OF RATING CLASSIFICATION.
An existing building within the scope of Division 88 of this Code shall not be
changed from one rating classification, as described in Section 91.8804, to another
higher risk rating classification unless the building meets or is altered to meet the
requirements of CBC Appendix Chapter A 1 for the proposed rating classification and
the building meets or is altered to meet the other requirements of this Code for the use
or occupancy change.
EXCEPTION: An existing building within the scope of Division 88 of this
Code shall not be changed from one occupancy category as defined in
Subsection 91.1604.5 to another higher occupancy category unless the building
meets or is altered to meet the other requirements of this Code.
Sec. 138. Section 91.8203 of the Los Angeles Municipal Code is amended to
read as follows:
SEC. 91.8203. CHANGE OF OCCUPANCY GROUP OR GROUP DIVISION.
Every change of occupancy to one classified in a different group or a different
division of the same group, as described in Division 3 of this Code, shall require a new
Certificate of Occupancy whether or not any alterations to the building are required by
this Code. For the purpose of this subdivision, the occupancy group and division of
interconnected assembly rooms shall be based on the total occupant load in such
rooms.
If the building or portion thereof does not conform to the requirements of this
Code for the proposed occupancy group or division, the building or portion thereof shall
be made to conform. The Department may issue a new Certificate of Occupancy
without stating therein that all of the requirements of the Code have been met and
without requiring compliance with all such requirements if it is found that the change in
occupancy group or division will result in no overall increase in hazard to life, limb,
health, property or public welfare.
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Sec. 139. The second unnumbered Paragraph of Section 91.8204 of the
Los Angeles Municipal Code is amended to read as follows:
Any assembly occupancy in a building constructed prior to October 6, 1933, shall
not be expanded or arranged to accommodate a larger number of occupants than that
for which it was previously authorized by the Department unless the entire building
conforms to the provisions of Division 16.
Sec. 140. Subdivision S of Subsection 91.8501.2 of the Los Angeles Municipal
Code is deleted in its entirety.
Sec. 141. Subdivision C of Subsection 91.8501.2 of the Los Angeles Municipal
Code is renumbered as Subdivision B and amended to read as follows:
B.
Structural Requirements for all Existing Buildings.
For all
existing buildings, the change of occupancy or use of any portion of an Existing
Building to a Joint Living and Work Quarters may be permitted provided the
entire building complies or is made to comply with all the structural requirements
in Section 91.8502.12 of this division.
Sec. 142. The definitions of FEMA 351 ,"RECOMMENDED SEISMIC
EVALUATION AND UPGRADE CRITERIA FOR EXISTING WELDED STEEL MOMENT
FRAME BUILDINGS" and FEMA 356, "PRESTANDARD AND COMMENTARY FOR
THE SEISMIC REHABILITATION OF BUILDINGS" in Subsection 91.8501.3 of the Los
Angeles Municipal Code are deleted in their entirety.
Sec. 143. The first unnumbered Paragraph of Subsection 91.8502.1.2 of the
Los Angeles Municipal Code is amended to read as follows:
91.8502.1.2. Emergency Escape. Every room below the fourth story where occupants
sleep in Joint Living and Work Quarters shall be provided with an emergency escape or
rescue window or door, which complies with the requirements of CSC Section 1029.
Sec. 144. The third unnumbered Paragraph of Subsection 91.8502.3.2 of the
Los Angeles Municipal Code is amended to read as follows:
Combination fire and smoke dampers shall be listed to conform to UL 555 and
UL 555S and smoke dampers shall be listed to conform to UL 555S and they shall be
accessible for inspection, service and repair. Pneumatic tubing to operate these
dampers shall be of noncombustible materials.
Sec. 145. The first unnumbered paragraph of Subsection 91.8502.5 of the
Los Angeles Municipal Code is amended to read as follows:
91.8502.5. Fire Alarm System. If a fire alarm system is required by CBC Section
907.2.9 or 403.4.2 for a new building of the same type of construction and occupancy,
78
or installed at the option of the owner, then the entire building shall have fire alarm
systems that are in full compliance with CBC Section 907.2.9. In a high-rise building,
the fire alarm systems shall be supplied by a generator used as an emergency system
in accordance with CBC Section 403.4.8. For all other buildings, an alternate source of
power may be used provided it is approved by both the Fire Department and the
Department.
Sec. 146. Paragraph 2 of Subsection 91.8502.7.1 of the Los Angeles Municipal
Code is amended to read as follows:
2. Existing doors between the corridor and the Joint Living and Work
Quarters that are part of the historic fabric of a Qualified Historical Building may
be allowed to remain provided approved smoke gaskets and self-closing and
latching devices to prevent smoke penetration are installed on the door, or the
existing door shall be replaced with a door conforming to the requirements of
CBC Section 715.4.
Sec. 147. Subsection 91.8502.12 of the Los Angeles Municipal Code is
amended to read as follows:
91.8502.12. Structural Design Requirements (Seismic Provision). The conversion
of any portion of an Existing Building to a Joint Living and Work Quarters shall be
analyzed for 75 percent of the Design Earthquake Ground motion, as defined in
CBC Section 1613.2 and as specified in CBC Section 1613.5, but in no event shall there
be a reduction in the capacity of the seismic force resisting system where that system
provides a greater level of protection than the minimum requirements established by
this division.
EXCEPTION: Unreinforced Masonry Bearing Wall Buildings (URM).
The conversion of any portion of an existing URM building shall comply with of
Appendix Chapter A 1 of Part 10 of the California Code of Regulations Title 24
(California Existing Building Code).
Performance-based engineering analysis and design procedures may be used to
evaluate the existing structure and the design of strengthening elements when
approved by the Superintendent of Building. All structural elements of the building shall
be strengthened to meet the minimum design analysis as specified in Subsections
91.8502.12.1 through 91.8502.12. 3 of this Code or new structural elements shall be
added when required. All new structural elements shall meet current detailing
requirements of CBC Section 1604.
For other types of buildings not mentioned in this section, such as Steel Frame
Buildings with Semi-Rigid Beam-Column Connections, Dual Systems with Steel
Moment Frames and Concrete Shear Walls, or Steel Frame Buildings with Steel
Bracing, shall comply with the standards developed by the Department.
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Sec. 148. Subsection 91.8502.12.1 of the Los Angeles Municipal Code is
deleted in its entirety.
Sec. 149. Subsection 91.8502.12.2 of the Los Angeles Municipal Code is
renumbered as Subsection 91.8502.12.1 and amended to read as follows:
91.8502.12.1. Reinforced Concrete Buildings and Concrete Frame Buildings With
and Without Masonry Infill Walls. Reinforced concrete buildings or concrete frame
buildings with or without masonry infill walls and that are within the scope of Section
91.9502 of this article, shall comply with all the provisions of Division 95 of this article.
EXCEPTION: When approved by the Superintendent of Building, the
Guidelines for Seismic Retrofit of Existing Buildings may be permitted as an
alternate standard to strengthen reinforced concrete buildings and concrete
frame buildings with and without masonry infill walls.
Sec. 150. Subsection 91.8502.12.3 of the Los Angeles Municipal Code is
renumbered as Subsection 91.8502.12.2 and amended to read as follows:
91.8502.12.2. Steel Frame Buildings with Masonry Infill Walls. Steel frame
buildings with masonry infill walls shall be made to comply with the standards as
developed by the Department and all the provisions of Division 95 of this article except
for the following: Item A of Subsection 91.9509.6 of this Article, Items 1 and 2 of
Subsection 91.9509.7.2 of this Article, and Subsections 91.9509.9 and 91.9511.5.1 of
th is Article.
Sec. 151. Subsection 91.8502.12.4 of the Los Angeles Municipal Code is
renumbered as Subsection 91.8502.12.3.
Sec. 152. The first unnumbered Paragraph of Section 91.9305.2 of the
Los Angeles Municipal Code is amended to read as follows:
91.9305.2. Scope. This Division requires the alteration, repair, replacement or addition
of structural elements and their connections to meet the strength and stiffness
requirements of this Code. The lateral load path analysis shall include the resisting
elements and connections from the wood diaphragm above any soft, weak or open front
wall lines to the foundation soil interface or reinforced concrete slab or masonry wall
supporting elements below. The top story of any building need not be analyzed. The
lateral load path analysis for added structural elements shall also include evaluation of
the allowable soil bearing and lateral pressures in accordance with Section 1806 of this
Code.
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Sec. 153. Subsection 91.9305.3 of the Los Angeles Municipal Code is amended
to read as follows:
91.9305.3. Design Base Shear. The design base shear shall be 75 percent of the
value from Section 12.8.1 of ASCE 7. The value of R used in the design of the
strengthening of any story shall not exceed the lowest value of R used in the same
direction at any story above. The system overstrength factor,Oo, and the deflection
amplification factor, Ce, shall not be less than the largest respective value corresponding
to the R factor being used in the direction under consideration.
EXCEPTIONS:
1.
For structures assigned to Seismic Design Category B, value of R,
00, and Ce, shall be permitted to be based on the seismic force-resisting system
being used to achieve the required strengthening.
2.
For structures assigned to Seismic Design Category Cor D, value
of R, 00, and Ce. shall be permitted to be based on the seismic force-resisting
system being used to achieve the required strengthening, provided that when the
strengthening is complete, the strengthened structure will not have an extreme
weak story irregularity defined as Type 5b in ASCE 7 Table 12.3-2.
3.
For structures assigned to Seismic Design Category E, value of R,
00, and Ce, shall be permitted to be based on the seismic force-resisting system
being used to achieve the required strengthening, provided that when the
strengthening is complete, the strengthened structure will not have an extreme
soft story, a weak story, or an extreme weak story irregularity defined,
respectively, as Type 1b, 5a and 5b in ASCE 7 Table 12.3-2.
Sec. 154. The first unnumbered Paragraph of Subsection 91.9305.6 of the
Los Angeles Municipal Code is amended to read as follows:
91.9305.6. Story Drift Limitation. The calculated story drift for each retrofitted level
shall not exceed the allowable deformation compatible with all vertical load-resisting
elements and 0.025 times the story height. The calculated story drift shall not be
reduced by the effects of horizontal diaphragm stiffness but shall be increased when
these effects produce rotation. Drift calculations shall be in accordance with the
Building Code.
Sec. 155. Subsection 91.9305.7 of the Los Angeles Municipal Code is amended
to read as follows:
91.9305.7. P-Delta Effect. The requirements of the Building Code shall apply, except
as modified herein. All structural framing elements and their connections not required
by the design to be part of the lateral force resisting system shall be designed and/or
detailed to be adequate to maintain support of design dead plus live loads when subject
81
to the expected deformations caused by seismic forces. The stress analysis of
cantilever columns shall use a buckling factor of 2.1 for the direction normal to the axis
of the beam.
Sec. 156. Subsection 91.9305.8 of the Los Angeles Municipal Code is amended
to read as follows:
91.9305.8. Ties and Continuity. All parts of the structure included in the scope of
Subsection 91.9305.2 shall be interconnected and the connection shall be capable of
resisting the seismic force created by the parts being connected. Any smaller portion of
a building shall be tied to the remainder of the building with elements having a strength
of C, times the tributary dead load of the smaller portion. A positive connection for
resisting a horizontal force acting parallel to the member shall be provided for each
beam, girder or truss included in the lateral load path. This force shall not be less than
0.08 times the combined tributary dead and live loads or as required by the lateral load
path transfer, whichever is greater.
Sec. 157. Subsection 91.9305.9 of the Los Angeles Municipal Code is amended
to read as follows:
91.9305.9. Collector Elements. Collector elements shall be provided which can
transfer the seismic forces originating in other portions of the building to the elements
within the scope of Section 91.9305.2 that provide resistance to those forces as defined
in Section 91.9305.3.
Sec. 158. Subsection 91.9305.11 of the Los Angeles Municipal Code is
amended to read as follows:
91.9305.11. Wood-Framed Shear Walls. Shear walls shall have sufficient strength
and stiffness to resist the tributary seismic loads and shall conform to the special
requirements of this section.
Sec. 159. Subsection 91.9305.11.2.1 of the Los Angeles Municipal Code is
amended to read as follows:
91.9305.11.2.1. Drift Limit. Wood structural panel shear walls shall meet the story drift
limitation of Subsection 91.9305.6. Conformance to the story drift limitation shall be
determined by approved testing or calculation or analogies drawn from there and not
the use of an aspect ratio. Calculated deflection shall be in accordance with Division 23
of this Code, "Calculation of Shear Wall Deflection" and 25 percent shall be added to
account for inelastic action and repetitive loading. Contribution to the deflection from
the anchor or tie down slippage shall also be included. The slippage contribution shall
include the vertical elongation of the metal, the vertical slippage of the connectors and
compression or shrinkage of the wood elements. The vertical slippage shall be
multiplied by the aspect ratio and added to the total horizontal deflection. Individual
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shear panels shall be permitted to exceed the maximum aspect ratio provided the story
drift and allowable shear capacities are not exceeded.
Sec. 160. Subsection 91.9305.11.2.2 of the Los Angeles Municipal Code is
amended to read as follows:
91.9305.11.2.2. Openings. Shear walls are permitted to be designed for continuity
around openings in accordance with the Building Code. Blockings and steel strapping
shall be provided at corners of the openings to transfer forces from the discontinuous
boundary elements into adjoining panel elements. Alternatively, perforated shear wall
provisions of the Building Code are permitted to be used.
Relocated and altered openings shall comply with the emergency escape
requirements in Division 10 of this Code. Relocated and altered openings shall comply
with the light and ventilation requirements in Division 12 of this Code unless otherwise
approved by the Superintendent of Building.
Sec. 161. Subsection 91.9305.11.2.3 of the Los Angeles Municipal Code is
amended to read as follows:
91.9305.11.2.3.
wood structural
allowable shear
values for wood
this Code.
Wood Species of Framing Members. Allowable shear values for
panels shall consider the species of the framing members. When the
values are constructed of other species of lumber, the allowable shear
structural panels shall be determined in accordance with Division 23 of
Sec. 162. Subsection 91.9306.2 of the Los Angeles Municipal Code is amended
to read as follows:
91.9306.2. Allowable Foundation and Lateral Pressures. Allowable foundation and
lateral pressures shall be permitted to use the values from CBC Table 1806.2. For soil
that supports embedded vertical elements, Subsection 91.9305.6 shall apply.
Sec. 163. The definition of FOUNDATION EXTENDING IN THE DOWNHILLDIRECTION in Section 91.9403 of the Los Angeles Municipal Code is amended to read
as follows:
FOUNDATION EXTENDING IN THE DOWNHILL-DIRECTION is a
descending foundation and approximately perpendicular to the slope contours.
83
Sec. 164. Subsection 91.9406.1.2 of the Los Angeles Municipal Code is
amended to read as follows:
91.9406.1.2. Design Base Shear. The design base shear shall be that required at the
time of the original building permit, or not less than 75 percent of the currently required
by Section 12.8.1 of ASCE 7, but in no case not less than the following:
V= 0.133 W.
Where:
V= The total design lateral force or shear at the base.
W= The total seismic dead load defined in Section 12.7.2 of ASCE 7.
Sec. 165. Subsection 91.9406.5.8 of the Los Angeles Municipal Code is
amended to read as follows:
91.9406.5.8. Seismic Load Factor. Steel elements of the diaphragm anchorage
systems and continuity ties shall be designed by the allowable stress design method
using a load factor of 1.7. The strength design specified in Section 91.1912.1 using a
load factor of 2.0 in lieu of 1.4 for earthquake loading shall be used for the design of
embedment in concrete.
Sec. 166. Item 4 of Subsection 91.9406.7.2 of the Los Angeles Municipal Code
is amended to read as follows:
4. The design lateral forces shall be distributed to lateral force resisting
elements of varying heights in accordance with the stiffness of each individual
element. The stiffness of a stepped wood structural panel shear wall may be
determined by dividing the wall into adjacent rectangular elements, subject to the
same top of wall deflection. Deflections of shear walls may be estimated by
Sections 91.2305.3.2 and 91.2305.3.8.2.9 or other equivalent methods.
Sheathing and fastening requirements for the stiffest section shall be used for the
entire wall. Each section of wall shall be anchored for shear and uplift at each
step as an independent shear wall.
Sec. 167. Subsection 91.9408.3 of the Los Angeles Municipal Code is amended
to read as follows:
91.9408.3. Structural Observation by the Engineer or Architect of Record. The
owner shall employ the engineer or architect of record, or other engineer or architect
designated by the engineer or architect of record, to perform structural observations as
required by Section 91.1710 of the Los Angeles Building Code.
84
Sec. 168. Subsection 91.9516.3 of the Los Angeles Municipal Code is amended
to read as follows:
91.9516.3. Engineer's Statement.
approved plans, the following:
The responsible engineer shall state on the
1. "I am responsible for this building's seismic strengthening design in
compliance with the minimum seismic resistance standards of Chapter 95 of the
Los Angeles Building Code."
or when applicable:
2. "The Registered Deputy Inspector, required as a condition of the use of
structural design stresses requiring continuous inspection, will be responsible to
me as required by Section 91.1704 of the Los Angeles Building Code."
Sec. 169. The first unnumbered Paragraph of Section 91.9603 of the
Los Angeles Municipal Code is amended to read as follows:
For the purposes of this Division, the applicable definitions in Division 2, Sections
1602,1613.2,1902
and 2302 of this Code; Sections 1.2, 3.1,4.1 and 11.2 of ASCE 7,
and the following shall apply:
Sec. 170. The first unnumbered Paragraph of Subsection 91.9604.3 of the
Los Angeles Municipal Code is amended to read as follows:
91.9604.3. Development of Anchor Loads into the Diaphragm. Development of
anchor loads into roof and floor diaphragms shall comply with Section 12.11 of ASCE 7.
Sec. 171. Subdivision (3) of Subsection (b) of Section 98.0719 of the
Los Angeles Municipal Code is amended to read as follows:
(3) Whether any of the exceptions set forth in Section 98.0716(a)(3)(A)
through (C) have been met.
85
Sec. 172. Urgency Clause. The City Council finds and declares that this
Ordinance is required for the immediate protection of the public peace, health and
safety for the following reason: In order for the City of Los Angeles to facilitate a
seamless transition with the State of California and its Building Code and maintain
predictability and streamlined case processing for the benefit of economic development
during distressed times, it is necessary to immediately adopt the foregoing exceptions,
modifications and additions to the California Building Code. Additionally, the California
Building Code becomes effective on January 1, 2014 and the amendments to that code
as reflected herein must be adopted by the City Council and become effective as soon
as possible. The Council, therefore, with the Mayor's concurrence, adopts this
ordinance to become effective upon publication pursuant to Los Angeles City Charter
Section 253.
86
Sec. 173. The City Clerk shall certify to the passage of this ordinance and have
it published in accordance with Council policy, either in a daily newspaper circulated
in the City of Los Angeles or by posting for ten days in three public places in the City of
Los Angeles: one copy on the bulletin board located at the Main Street entrance to the
Los Angeles City Hall; one copy on the bulletin board located at the Main Street
entrance to the Los Angeles City Hall East; and one copy on the bulletin board located
at the Temple Street entrance to the Los Angeles County Hall of Records.
I hereby certify that this ordinance was passed by the Council of the City of
Los Angeles, by a vote of not less than three-fourths of all of its members, at its
meeting of
nEC 11 2013
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MICHAEL N. FEUER, City Attorney
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Building Code Ordinance KRW Draft